37
|
warren |
September 25, 2017 19:15
| about 7 years ago
A draft page for collecting and organizing information, questions, and projects related to hydrogen sulfide, also known as H2S.
Hydrogen sulfide is a colorless, flammable, extremely hazardous gas with a “rotten egg” smell. It occurs naturally in crude petroleum and natural gas, and can be produced by the breakdown of organic matter and human/ animal wastes (e.g., sewage). It is heavier than air and can collect in low-lying and enclosed, poorly ventilated areas such as basements, manholes, sewer lines and underground telephone/electrical vaults. (via OSHA.gov)
Framing the problem
We are transferring these questions to the Questions system -- please copy them into a question
- Where is this an issue?
- Who's working on this already?
- What information is missing, if any? How will it change the situation?
- What are they key parameters:
- What intensities & exposure times are harmful to humans or the environment?
- Where and how can it be detected? by smell range?
- How long does it take to detect?
- How fast does it move/change, or how large an area does it affect?
- What kind of detection? presence/absence? direction of flow? intensity or locating a spot source?
- What should the output data look like? Graphs, logs, lights, images?
- What are the data’s uses/outcomes? Legal? Avoidance? Remediation? Regulation?
Where is this an issue?
Here I've ( @warren ) collected some of the notes folks have posted on PublicLab.org about where H2S has been a problem, under the tag #h2s-sites :
[notes:h2s-sites]
Post more on H2S sites - help build out this list by posting your own notes on H2S-affected sites
Detecting H2S
Wikipedia's article, which is pretty well referenced, shows that:
0.00047 ppm or 0.47 ppb is the odor threshold, the point at which 50% of a human panel can detect the presence of an odor without being able to identify it.
This seems to be well below what's cited as a risk to health, but OSHA warns not to use smell as a means to detect it (OSHA.gov):
Can be smelled at low levels, but with continuous lowlevel exposure or at higher concentrations you lose your ability to smell the gas even though it is still present.
At high concentrations – your ability to smell the gas can be lost instantly.
DO NOT depend on your sense of smell for indicating the continuing presence of this gas or for warning of hazardous concentrations.
Most info I've ( @warren ) compiled here shows 10+ parts per million as when health effects are of concern, but one cites a TWA (time weighted average) of 1ppm -- over 8 hours. See below in the health effects section.
Questions
Some questions about detecting hydrogen sulfide are below.
We are transferring these questions to the Questions system -- please copy them into a question
- What equipment is available today, and who has access to it? How much does it cost and what is its sensitivity/latency? How much does it weigh and how does it work (air grab sample, continuous flow, soil sample?)
- Are there alternative means of detecting which are dramatically different/cheaper?
- silver film tarnishes with exposure to H2S, some sources cite discolored copper coins in someone's pocket as a way to diagnose a high exposure
We're collecting questions about H2S detection - please add your own here:
[questions:hydrogen-sulfide]
Health effects
Health effects vary with how long, and at what level, you are exposed. Asthmatics may be at greater risk.
Low concentrations – irritation of eyes, nose, throat, or respiratory system; effects can be delayed.
Moderate concentrations – more severe eye and respiratory effects, headache, dizziness, nausea, coughing, vomiting and difficulty breathing.
High concentrations – shock, convulsions, unable to breathe, coma, death; effects can be extremely rapid (within a few breaths).
(Exposure information from OSHA.gov)
Exposure limits from various sources, from an Airgas Materials Safety Data Sheet:
ACGIH TLV (United States, 3/2016).
STEL: 5 ppm 15 minutes.
TWA: 1 ppm 8 hours.
NIOSH REL (United States, 10/2013).
CEIL: 15 mg/m³ 10 minutes.
CEIL: 10 ppm 10 minutes.
OSHA PEL 1989 (United States, 3/1989).
STEL: 21 mg/m³ 15 minutes.
STEL: 15 ppm 15 minutes.
TWA: 14 mg/m³ 8 hours.
TWA: 10 ppm 8 hours.
OSHA PEL Z2 (United States, 2/2013).
AMP: 50 ppm 10 minutes.
CEIL: 20 ppm
Note that these show toxicity at levels close to the ability of the wearable electronic monitors (see above) can detect -- 10-15ppm; "STEL" means Short Term Exposure Limit, or an "acceptable average exposure over a short period of time."
Existing work on Public Lab.org
A range of projects related to H2S have been developed here over the years; we're going to try to organize it better, but for now:
[notes:hydrogen-sulfide]
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Revert |
|
36
|
warren |
September 25, 2017 19:14
| about 7 years ago
A draft page for collecting and organizing information, questions, and projects related to hydrogen sulfide, also known as H2S.
Hydrogen sulfide is a colorless, flammable, extremely hazardous gas with a “rotten egg” smell. It occurs naturally in crude petroleum and natural gas, and can be produced by the breakdown of organic matter and human/ animal wastes (e.g., sewage). It is heavier than air and can collect in low-lying and enclosed, poorly ventilated areas such as basements, manholes, sewer lines and underground telephone/electrical vaults. (via OSHA.gov)
Framing the problem
We are transferring these questions to the Questions system -- please copy them into a question
- Where is this an issue?
- Who's working on this already?
- What information is missing, if any? How will it change the situation?
- What are they key parameters:
- What intensities & exposure times are harmful to humans or the environment?
- Where and how can it be detected? by smell range?
- How long does it take to detect?
- How fast does it move/change, or how large an area does it affect?
- What kind of detection? presence/absence? direction of flow? intensity or locating a spot source?
- What should the output data look like? Graphs, logs, lights, images?
- What are the data’s uses/outcomes? Legal? Avoidance? Remediation? Regulation?
Where is this an issue?
Here I've ( @warren ) collected some of the notes folks have posted on PublicLab.org about where H2S has been a problem, under the tag #h2s-sites :
[notes:h2s-sites]
Post more on H2S sites - help build out this list by posting your own notes on H2S-affected sites
Detecting H2S
Wikipedia's article, which is pretty well referenced, shows that:
0.00047 ppm or 0.47 ppb is the odor threshold, the point at which 50% of a human panel can detect the presence of an odor without being able to identify it.
This seems to be well below what's cited as a risk to health, but OSHA warns not to use smell as a means to detect it (OSHA.gov):
Can be smelled at low levels, but with continuous lowlevel exposure or at higher concentrations you lose your ability to smell the gas even though it is still present.
At high concentrations – your ability to smell the gas can be lost instantly.
DO NOT depend on your sense of smell for indicating the continuing presence of this gas or for warning of hazardous concentrations.
Most info I've ( @warren ) compiled here shows 10+ parts per million as when health effects are of concern, but one cites a TWA (time weighted average) of 1ppm -- over 8 hours. See below in the health effects section.
Questions about detection
Some questions about detecting hydrogen sulfide are below.
We are transferring these questions to the Questions system -- please copy them into a question
- What equipment is available today, and who has access to it? How much does it cost and what is its sensitivity/latency? How much does it weigh and how does it work (air grab sample, continuous flow, soil sample?)
- Are there alternative means of detecting which are dramatically different/cheaper?
- silver film tarnishes with exposure to H2S, some sources cite discolored copper coins in someone's pocket as a way to diagnose a high exposure
We're collecting questions about H2S detection - please add your own here:
Questions
[questions:hydrogen-sulfide]
Health effects
Health effects vary with how long, and at what level, you are exposed. Asthmatics may be at greater risk.
Low concentrations – irritation of eyes, nose, throat, or respiratory system; effects can be delayed.
Moderate concentrations – more severe eye and respiratory effects, headache, dizziness, nausea, coughing, vomiting and difficulty breathing.
High concentrations – shock, convulsions, unable to breathe, coma, death; effects can be extremely rapid (within a few breaths).
(Exposure information from OSHA.gov)
Exposure limits from various sources, from an Airgas Materials Safety Data Sheet:
ACGIH TLV (United States, 3/2016).
STEL: 5 ppm 15 minutes.
TWA: 1 ppm 8 hours.
NIOSH REL (United States, 10/2013).
CEIL: 15 mg/m³ 10 minutes.
CEIL: 10 ppm 10 minutes.
OSHA PEL 1989 (United States, 3/1989).
STEL: 21 mg/m³ 15 minutes.
STEL: 15 ppm 15 minutes.
TWA: 14 mg/m³ 8 hours.
TWA: 10 ppm 8 hours.
OSHA PEL Z2 (United States, 2/2013).
AMP: 50 ppm 10 minutes.
CEIL: 20 ppm
Note that these show toxicity at levels close to the ability of the wearable electronic monitors (see above) can detect -- 10-15ppm; "STEL" means Short Term Exposure Limit, or an "acceptable average exposure over a short period of time."
Existing work on Public Lab.org
A range of projects related to H2S have been developed here over the years; we're going to try to organize it better, but for now:
[notes:hydrogen-sulfide]
|
Revert |
|
35
|
warren |
September 25, 2017 19:13
| about 7 years ago
A draft page for collecting and organizing information, questions, and projects related to hydrogen sulfide, also known as H2S.
Hydrogen sulfide is a colorless, flammable, extremely hazardous gas with a “rotten egg” smell. It occurs naturally in crude petroleum and natural gas, and can be produced by the breakdown of organic matter and human/ animal wastes (e.g., sewage). It is heavier than air and can collect in low-lying and enclosed, poorly ventilated areas such as basements, manholes, sewer lines and underground telephone/electrical vaults. (via OSHA.gov)
Framing the problem
We are transferring these questions to the Questions system -- please copy them into a question
- Where is this an issue?
- Who's working on this already?
- What information is missing, if any? How will it change the situation?
- What are they key parameters:
- What intensities & exposure times are harmful to humans or the environment?
- Where and how can it be detected? by smell range?
- How long does it take to detect?
- How fast does it move/change, or how large an area does it affect?
- What kind of detection? presence/absence? direction of flow? intensity or locating a spot source?
- What should the output data look like? Graphs, logs, lights, images?
- What are the data’s uses/outcomes? Legal? Avoidance? Remediation? Regulation?
Where is this an issue?
Here I've ( @warren ) collected some of the notes folks have posted on PublicLab.org about where H2S has been a problem, under the tag #h2s-sites :
[notes:h2s-sites]
Post more on H2S sites - help build out this list by posting your own notes on H2S-affected sites
Detecting H2S
Wikipedia's article, which is pretty well referenced, shows that:
0.00047 ppm or 0.47 ppb is the odor threshold, the point at which 50% of a human panel can detect the presence of an odor without being able to identify it.
This seems to be well below what's cited as a risk to health, but OSHA warns not to use smell as a means to detect it (OSHA.gov):
Can be smelled at low levels, but with continuous lowlevel exposure or at higher concentrations you lose your ability to smell the gas even though it is still present.
At high concentrations – your ability to smell the gas can be lost instantly.
DO NOT depend on your sense of smell for indicating the continuing presence of this gas or for warning of hazardous concentrations.
Most info I've ( @warren ) compiled here shows 10+ parts per million as when health effects are of concern, but one cites a TWA (time weighted average) of 1ppm -- over 8 hours. See below in the health effects section.
Questions about detection
Some questions about detecting hydrogen sulfide are below.
We are transferring these questions to the Questions system -- please copy them into a question
- What equipment is available today, and who has access to it? How much does it cost and what is its sensitivity/latency? How much does it weigh and how does it work (air grab sample, continuous flow, soil sample?)
- Are there alternative means of detecting which are dramatically different/cheaper?
- silver film tarnishes with exposure to H2S, some sources cite discolored copper coins in someone's pocket as a way to diagnose a high exposure
We're collecting questions about H2S detection - please add your own here:
Questions
[questions:hydrogen-sulfide]
Health effects
Health effects vary with how long, and at what level, you are exposed. Asthmatics may be at greater risk.
Low concentrations – irritation of eyes, nose, throat, or respiratory system; effects can be delayed.
Moderate concentrations – more severe eye and respiratory effects, headache, dizziness, nausea, coughing, vomiting and difficulty breathing.
High concentrations – shock, convulsions, unable to breathe, coma, death; effects can be extremely rapid (within a few breaths).
(Exposure information from OSHA.gov)
Exposure limits from various sources, from an Airgas Materials Safety Data Sheet:
ACGIH TLV (United States, 3/2016).
STEL: 5 ppm 15 minutes.
TWA: 1 ppm 8 hours.
NIOSH REL (United States, 10/2013).
CEIL: 15 mg/m³ 10 minutes.
CEIL: 10 ppm 10 minutes.
OSHA PEL 1989 (United States, 3/1989).
STEL: 21 mg/m³ 15 minutes.
STEL: 15 ppm 15 minutes.
TWA: 14 mg/m³ 8 hours.
TWA: 10 ppm 8 hours.
OSHA PEL Z2 (United States, 2/2013).
AMP: 50 ppm 10 minutes.
CEIL: 20 ppm
Note that these show toxicity at levels close to the ability of the wearable electronic monitors (see above) can detect -- 10-15ppm; "STEL" means Short Term Exposure Limit, or an "acceptable average exposure over a short period of time."
Existing work on Public Lab.org
A range of projects related to H2S have been developed here over the years; we're going to try to organize it better, but for now:
[notes:hydrogen-sulfide]
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Revert |
|
34
|
liz |
June 28, 2017 17:20
| over 7 years ago
A draft page for collecting and organizing information, questions, and projects related to hydrogen sulfide, also known as H2S.
Hydrogen sulfide is a colorless, flammable, extremely hazardous gas with a “rotten egg” smell. It occurs naturally in crude petroleum and natural gas, and can be produced by the breakdown of organic matter and human/ animal wastes (e.g., sewage). It is heavier than air and can collect in low-lying and enclosed, poorly ventilated areas such as basements, manholes, sewer lines and underground telephone/electrical vaults. (via OSHA.gov)
Framing the problem
- Where is this an issue?
- Who's working on this already?
- What information is missing, if any? How will it change the situation?
- What are they key parameters:
- What intensities & exposure times are harmful to humans or the environment?
- Where and how can it be detected? by smell range?
- How long does it take to detect?
- How fast does it move/change, or how large an area does it affect?
- What kind of detection? presence/absence? direction of flow? intensity or locating a spot source?
- What should the output data look like? Graphs, logs, lights, images?
- What are the data’s uses/outcomes? Legal? Avoidance? Remediation? Regulation?
Where is this an issue?
Here I've ( @warren ) collected some of the notes folks have posted on PublicLab.org about where H2S has been a problem, under the tag #h2s-sites :
[notes:h2s-sites]
Post more on H2S sites - help build out this list by posting your own notes on H2S-affected sites
Detecting H2S
Wikipedia's article, which is pretty well referenced, shows that:
0.00047 ppm or 0.47 ppb is the odor threshold, the point at which 50% of a human panel can detect the presence of an odor without being able to identify it.
This seems to be well below what's cited as a risk to health, but OSHA warns not to use smell as a means to detect it (OSHA.gov):
Can be smelled at low levels, but with continuous lowlevel exposure or at higher concentrations you lose your ability to smell the gas even though it is still present.
At high concentrations – your ability to smell the gas can be lost instantly.
DO NOT depend on your sense of smell for indicating the continuing presence of this gas or for warning of hazardous concentrations.
Most info I've ( @warren ) compiled here shows 10+ parts per million as when health effects are of concern, but one cites a TWA (time weighted average) of 1ppm -- over 8 hours. See below in the health effects section.
Questions about detection
Some questions to begin with include:
- What equipment is available today, and who has access to it? How much does it cost and what is its sensitivity/latency? How much does it weigh and how does it work (air grab sample, continuous flow, soil sample?)
- Are there alternative means of detecting which are dramatically different/cheaper?
- silver film tarnishes with exposure to H2S, some sources cite discolored copper coins in someone's pocket as a way to diagnose a high exposure
We're collecting questions about H2S detection - please add your own here:
[questions:h2s]
Health effects
Health effects vary with how long, and at what level, you are exposed. Asthmatics may be at greater risk.
Low concentrations – irritation of eyes, nose, throat, or respiratory system; effects can be delayed.
Moderate concentrations – more severe eye and respiratory effects, headache, dizziness, nausea, coughing, vomiting and difficulty breathing.
High concentrations – shock, convulsions, unable to breathe, coma, death; effects can be extremely rapid (within a few breaths).
(Exposure information from OSHA.gov)
Exposure limits from various sources, from an Airgas Materials Safety Data Sheet:
ACGIH TLV (United States, 3/2016).
STEL: 5 ppm 15 minutes.
TWA: 1 ppm 8 hours.
NIOSH REL (United States, 10/2013).
CEIL: 15 mg/m³ 10 minutes.
CEIL: 10 ppm 10 minutes.
OSHA PEL 1989 (United States, 3/1989).
STEL: 21 mg/m³ 15 minutes.
STEL: 15 ppm 15 minutes.
TWA: 14 mg/m³ 8 hours.
TWA: 10 ppm 8 hours.
OSHA PEL Z2 (United States, 2/2013).
AMP: 50 ppm 10 minutes.
CEIL: 20 ppm
Note that these show toxicity at levels close to the ability of the wearable electronic monitors (see above) can detect -- 10-15ppm; "STEL" means Short Term Exposure Limit, or an "acceptable average exposure over a short period of time."
Questions
Please ask questions to help us expand this set of resources:
[questions:h2s]
Existing work on Public Lab.org
A range of projects related to H2S have been developed here over the years; we're going to try to organize it better, but for now:
[notes:h2s]
|
Revert |
|
33
|
liz |
June 28, 2017 17:19
| over 7 years ago
A draft page for collecting and organizing information, questions, and projects related to hydrogen sulfide, also known as H2S.
Hydrogen sulfide is a colorless, flammable, extremely hazardous gas with a “rotten egg” smell. It occurs naturally in crude petroleum and natural gas, and can be produced by the breakdown of organic matter and human/ animal wastes (e.g., sewage). It is heavier than air and can collect in low-lying and enclosed, poorly ventilated areas such as basements, manholes, sewer lines and underground telephone/electrical vaults. (via OSHA.gov)
Framing the problem
- Where is this an issue?
- Who's working on this already?
- What information is missing, if any? How will it change the situation?
- What are they key parameters:
- What intensities & exposure times are harmful to humans or the environment?
- Where and how can it be detected? by smell range?
- How long does it take to detect?
- How fast does it move/change, or how large an area does it affect?
- What kind of detection? presence/absence? direction of flow? intensity or locating a spot source?
- What should the output data look like? Graphs, logs, lights, images?
- What are the data’s uses/outcomes? Legal? Avoidance? Remediation? Regulation?
Where is this an issue?
Here I've ( @warren ) collected some of the notes folks have posted on PublicLab.org about where H2S has been a problem, under the tag #h2s-sites :
[notes:h2s-sites]
Post more on H2S sites - help build out this list by posting your own notes on H2S-affected sites
Detecting H2S
Wikipedia's article, which is pretty well referenced, shows that:
0.00047 ppm or 0.47 ppb is the odor threshold, the point at which 50% of a human panel can detect the presence of an odor without being able to identify it.
This seems to be well below what's cited as a risk to health, but OSHA warns not to use smell as a means to detect it (OSHA.gov):
Can be smelled at low levels, but with continuous lowlevel exposure or at higher concentrations you lose your ability to smell the gas even though it is still present.
At high concentrations – your ability to smell the gas can be lost instantly.
DO NOT depend on your sense of smell for indicating the continuing presence of this gas or for warning of hazardous concentrations.
Most info I've (@warren) compiled here shows 10+ parts per million as when health effects are of concern, but one cites a TWA (time weighted average) of 1ppm -- over 8 hours. See below in the health effects section.
Questions about detection
Some questions to begin with include:
- What equipment is available today, and who has access to it? How much does it cost and what is its sensitivity/latency? How much does it weigh and how does it work (air grab sample, continuous flow, soil sample?)
- Are there alternative means of detecting which are dramatically different/cheaper?
- silver film tarnishes with exposure to H2S, some sources cite discolored copper coins in someone's pocket as a way to diagnose a high exposure
We're collecting questions about H2S detection - please add your own here:
[questions:h2s]
Health effects
Health effects vary with how long, and at what level, you are exposed. Asthmatics may be at greater risk.
Low concentrations – irritation of eyes, nose, throat, or respiratory system; effects can be delayed.
Moderate concentrations – more severe eye and respiratory effects, headache, dizziness, nausea, coughing, vomiting and difficulty breathing.
High concentrations – shock, convulsions, unable to breathe, coma, death; effects can be extremely rapid (within a few breaths).
(Exposure information from OSHA.gov)
Exposure limits from various sources, from an Airgas Materials Safety Data Sheet:
ACGIH TLV (United States, 3/2016).
STEL: 5 ppm 15 minutes.
TWA: 1 ppm 8 hours.
NIOSH REL (United States, 10/2013).
CEIL: 15 mg/m³ 10 minutes.
CEIL: 10 ppm 10 minutes.
OSHA PEL 1989 (United States, 3/1989).
STEL: 21 mg/m³ 15 minutes.
STEL: 15 ppm 15 minutes.
TWA: 14 mg/m³ 8 hours.
TWA: 10 ppm 8 hours.
OSHA PEL Z2 (United States, 2/2013).
AMP: 50 ppm 10 minutes.
CEIL: 20 ppm
Note that these show toxicity at levels close to the ability of the wearable electronic monitors (see above) can detect -- 10-15ppm; "STEL" means Short Term Exposure Limit, or an "acceptable average exposure over a short period of time."
Questions
Please ask questions to help us expand this set of resources:
[questions:h2s]
Existing work on Public Lab.org
A range of projects related to H2S have been developed here over the years; we're going to try to organize it better, but for now:
[notes:h2s]
|
Revert |
|
32
|
warren |
May 11, 2017 20:39
| over 7 years ago
A draft page for collecting and organizing information, questions, and projects related to hydrogen sulfide, also known as H2S.
Hydrogen sulfide is a colorless, flammable, extremely hazardous gas with a “rotten egg” smell. It occurs naturally in crude petroleum and natural gas, and can be produced by the breakdown of organic matter and human/ animal wastes (e.g., sewage). It is heavier than air and can collect in low-lying and enclosed, poorly ventilated areas such as basements, manholes, sewer lines and underground telephone/electrical vaults. (via OSHA.gov)
Framing the problem
- Where is this an issue?
- Who's working on this already?
- What information is missing, if any? How will it change the situation?
- What are they key parameters:
- What intensities & exposure times are harmful to humans or the environment?
- Where and how can it be detected? by smell range?
- How long does it take to detect?
- How fast does it move/change, or how large an area does it affect?
- What kind of detection? presence/absence? direction of flow? intensity or locating a spot source?
- What should the output data look like? Graphs, logs, lights, images?
- What are the data’s uses/outcomes? Legal? Avoidance? Remediation? Regulation?
Where is this an issue?
Here I've (@warren) collected some of the notes folks have posted on PublicLab.org about where H2S has been a problem, under the tag #h2s-sites :
[notes:h2s-sites]
Post more on H2S sites - help build out this list by posting your own notes on H2S-affected sites
Detecting H2S
Wikipedia's article, which is pretty well referenced, shows that:
0.00047 ppm or 0.47 ppb is the odor threshold, the point at which 50% of a human panel can detect the presence of an odor without being able to identify it.
This seems to be well below what's cited as a risk to health, but OSHA warns not to use smell as a means to detect it (OSHA.gov):
Can be smelled at low levels, but with continuous lowlevel exposure or at higher concentrations you lose your ability to smell the gas even though it is still present.
At high concentrations – your ability to smell the gas can be lost instantly.
DO NOT depend on your sense of smell for indicating the continuing presence of this gas or for warning of hazardous concentrations.
Most info I've (@warren) compiled here shows 10+ parts per million as when health effects are of concern, but one cites a TWA (time weighted average) of 1ppm -- over 8 hours. See below in the health effects section.
Questions about detection
Some questions to begin with include:
- What equipment is available today, and who has access to it? How much does it cost and what is its sensitivity/latency? How much does it weigh and how does it work (air grab sample, continuous flow, soil sample?)
- Are there alternative means of detecting which are dramatically different/cheaper?
- silver film tarnishes with exposure to H2S, some sources cite discolored copper coins in someone's pocket as a way to diagnose a high exposure
We're collecting questions about H2S detection - please add your own here:
[questions:h2s]
Health effects
Health effects vary with how long, and at what level, you are exposed. Asthmatics may be at greater risk.
Low concentrations – irritation of eyes, nose, throat, or respiratory system; effects can be delayed.
Moderate concentrations – more severe eye and respiratory effects, headache, dizziness, nausea, coughing, vomiting and difficulty breathing.
High concentrations – shock, convulsions, unable to breathe, coma, death; effects can be extremely rapid (within a few breaths).
(Exposure information from OSHA.gov)
Exposure limits from various sources, from an Airgas Materials Safety Data Sheet:
ACGIH TLV (United States, 3/2016).
STEL: 5 ppm 15 minutes.
TWA: 1 ppm 8 hours.
NIOSH REL (United States, 10/2013).
CEIL: 15 mg/m³ 10 minutes.
CEIL: 10 ppm 10 minutes.
OSHA PEL 1989 (United States, 3/1989).
STEL: 21 mg/m³ 15 minutes.
STEL: 15 ppm 15 minutes.
TWA: 14 mg/m³ 8 hours.
TWA: 10 ppm 8 hours.
OSHA PEL Z2 (United States, 2/2013).
AMP: 50 ppm 10 minutes.
CEIL: 20 ppm
Note that these show toxicity at levels close to the ability of the wearable electronic monitors (see above) can detect -- 10-15ppm; "STEL" means Short Term Exposure Limit, or an "acceptable average exposure over a short period of time."
Questions
Please ask questions to help us expand this set of resources:
[questions:h2s]
Existing work on Public Lab.org
A range of projects related to H2S have been developed here over the years; we're going to try to organize it better, but for now:
[notes:h2s]
|
Revert |
|
31
|
warren |
May 11, 2017 20:27
| over 7 years ago
A draft page for collecting and organizing information, questions, and projects related to hydrogen sulfide, also known as H2S.
Hydrogen sulfide is a colorless, flammable, extremely hazardous gas with a “rotten egg” smell. It occurs naturally in crude petroleum and natural gas, and can be produced by the breakdown of organic matter and human/ animal wastes (e.g., sewage). It is heavier than air and can collect in low-lying and enclosed, poorly ventilated areas such as basements, manholes, sewer lines and underground telephone/electrical vaults. (via OSHA.gov)
Framing the problem
- Where is this an issue?
- Who's working on this already?
- What information is missing, if any? How will it change the situation?
- What are they key parameters:
- What intensities & exposure times are harmful to humans or the environment?
- Where and how can it be detected? by smell range?
- How long does it take to detect?
- How fast does it move/change, or how large an area does it affect?
- What kind of detection? presence/absence? direction of flow? intensity or locating a spot source?
- What should the output data look like? Graphs, logs, lights, images?
- What are the data’s uses/outcomes? Legal? Avoidance? Remediation? Regulation?
Where is this an issue?
Here I've (@warren) collected some of the notes folks have posted on PublicLab.org about where H2S has been a problem, under the tag #h2s-sites :
[notes:h2s-sites]
Detecting H2S
Wikipedia's article, which is pretty well cited, shows that:
0.00047 ppm or 0.47 ppb is the odor threshold, the point at which 50% of a human panel can detect the presence of an odor without being able to identify it.
This seems to be well below what's cited as a risk to health, but OSHA warns not to use smell as a means to detect it (OSHA.gov):
Can be smelled at low levels, but with continuous lowlevel exposure or at higher concentrations you lose your ability to smell the gas even though it is still present.
At high concentrations – your ability to smell the gas can be lost instantly.
DO NOT depend on your sense of smell for indicating the continuing presence of this gas or for warning of hazardous concentrations.
- What equipment is available today, and who has access to it? How much does it cost and what is its sensitivity/latency? How much does it weigh and how does it work (air grab sample, continuous flow, soil sample?)
- Are there alternative means of detecting which are dramatically different/cheaper?
- silver film tarnishes with exposure to H2S, some sources cite discolored copper coins in someone's pocket as a way to diagnose a high exposure
Health effects
Health effects vary with how long, and at what level, you are exposed. Asthmatics may be at greater risk.
Low concentrations – irritation of eyes, nose, throat, or respiratory system; effects can be delayed.
Moderate concentrations – more severe eye and respiratory effects, headache, dizziness, nausea, coughing, vomiting and difficulty breathing.
High concentrations – shock, convulsions, unable to breathe, coma, death; effects can be extremely rapid (within a few breaths).
(Exposure information from OSHA.gov)
Exposure limits from various sources, from an Airgas Materials Safety Data Sheet:
ACGIH TLV (United States, 3/2016).
STEL: 5 ppm 15 minutes.
TWA: 1 ppm 8 hours.
NIOSH REL (United States, 10/2013).
CEIL: 15 mg/m³ 10 minutes.
CEIL: 10 ppm 10 minutes.
OSHA PEL 1989 (United States, 3/1989).
STEL: 21 mg/m³ 15 minutes.
STEL: 15 ppm 15 minutes.
TWA: 14 mg/m³ 8 hours.
TWA: 10 ppm 8 hours.
OSHA PEL Z2 (United States, 2/2013).
AMP: 50 ppm 10 minutes.
CEIL: 20 ppm
Note that these show toxicity at levels close to the ability of the wearable electronic monitors (see above) can detect -- 10-15ppm; "STEL" means Short Term Exposure Limit, or an "acceptable average exposure over a short period of time."
Questions
Please ask questions to help us expand this set of resources:
[questions:h2s]
Existing work on Public Lab.org
A range of projects related to H2S have been developed here over the years; we're going to try to organize it better, but for now:
[notes:h2s]
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Revert |
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30
|
warren |
May 11, 2017 20:25
| over 7 years ago
A draft page for collecting and organizing information, questions, and projects related to hydrogen sulfide, also known as H2S.
Hydrogen sulfide is a colorless, flammable, extremely hazardous gas with a “rotten egg” smell. It occurs naturally in crude petroleum and natural gas, and can be produced by the breakdown of organic matter and human/ animal wastes (e.g., sewage). It is heavier than air and can collect in low-lying and enclosed, poorly ventilated areas such as basements, manholes, sewer lines and underground telephone/electrical vaults. (via OSHA.gov)
Framing the problem
- Where is this an issue?
- Who's working on this already?
- What information is missing, if any? How will it change the situation?
- What are they key parameters:
- What intensities & exposure times are harmful to humans or the environment?
- Where and how can it be detected? by smell range?
- How long does it take to detect?
- How fast does it move/change, or how large an area does it affect?
- What kind of detection? presence/absence? direction of flow? intensity or locating a spot source?
- What should the output data look like? Graphs, logs, lights, images?
- What are the data’s uses/outcomes? Legal? Avoidance? Remediation? Regulation?
Where is this an issue?
Here I've (@warren) collected some of the notes folks have posted on PublicLab.org about where H2S has been a problem, under the tag #h2s-sites:
[notes:h2s-sites]
Detecting H2S
Wikipedia's article, which is pretty well cited, shows that:
0.00047 ppm or 0.47 ppb is the odor threshold, the point at which 50% of a human panel can detect the presence of an odor without being able to identify it.
This seems to be well below what's cited as a risk to health, but OSHA warns not to use smell as a means to detect it (OSHA.gov):
Can be smelled at low levels, but with continuous lowlevel exposure or at higher concentrations you lose your ability to smell the gas even though it is still present.
At high concentrations – your ability to smell the gas can be lost instantly.
DO NOT depend on your sense of smell for indicating the continuing presence of this gas or for warning of hazardous concentrations.
- What equipment is available today, and who has access to it? How much does it cost and what is its sensitivity/latency? How much does it weigh and how does it work (air grab sample, continuous flow, soil sample?)
- Are there alternative means of detecting which are dramatically different/cheaper?
- silver film tarnishes with exposure to H2S, some sources cite discolored copper coins in someone's pocket as a way to diagnose a high exposure
Health effects
Health effects vary with how long, and at what level, you are exposed. Asthmatics may be at greater risk.
Low concentrations – irritation of eyes, nose, throat, or respiratory system; effects can be delayed.
Moderate concentrations – more severe eye and respiratory effects, headache, dizziness, nausea, coughing, vomiting and difficulty breathing.
High concentrations – shock, convulsions, unable to breathe, coma, death; effects can be extremely rapid (within a few breaths).
(Exposure information from OSHA.gov)
Exposure limits from various sources, from an Airgas Materials Safety Data Sheet:
ACGIH TLV (United States, 3/2016).
STEL: 5 ppm 15 minutes.
TWA: 1 ppm 8 hours.
NIOSH REL (United States, 10/2013).
CEIL: 15 mg/m³ 10 minutes.
CEIL: 10 ppm 10 minutes.
OSHA PEL 1989 (United States, 3/1989).
STEL: 21 mg/m³ 15 minutes.
STEL: 15 ppm 15 minutes.
TWA: 14 mg/m³ 8 hours.
TWA: 10 ppm 8 hours.
OSHA PEL Z2 (United States, 2/2013).
AMP: 50 ppm 10 minutes.
CEIL: 20 ppm
Note that these show toxicity at levels close to the ability of the wearable electronic monitors (see above) can detect -- 10-15ppm; "STEL" means Short Term Exposure Limit, or an "acceptable average exposure over a short period of time."
Questions
Please ask questions to help us expand this set of resources:
[questions:h2s]
Existing work on Public Lab.org
A range of projects related to H2S have been developed here over the years; we're going to try to organize it better, but for now:
[notes:h2s]
|
Revert |
|
29
|
warren |
May 09, 2017 21:22
| over 7 years ago
A draft page for collecting and organizing information, questions, and projects related to hydrogen sulfide, also known as H2S.
Hydrogen sulfide is a colorless, flammable, extremely hazardous gas with a “rotten egg” smell. It occurs naturally in crude petroleum and natural gas, and can be produced by the breakdown of organic matter and human/ animal wastes (e.g., sewage). It is heavier than air and can collect in low-lying and enclosed, poorly ventilated areas such as basements, manholes, sewer lines and underground telephone/electrical vaults. (via OSHA.gov)
Framing the problem
- Where is this an issue?
- Who's working on this already?
- What information is missing, if any? How will it change the situation?
- What are they key parameters:
- What intensities & exposure times are harmful to humans or the environment?
- Where and how can it be detected? by smell range?
- How long does it take to detect?
- How fast does it move/change, or how large an area does it affect?
- What kind of detection? presence/absence? direction of flow? intensity or locating a spot source?
- What should the output data look like? Graphs, logs, lights, images?
- What are the data’s uses/outcomes? Legal? Avoidance? Remediation? Regulation?
Detecting H2S
Wikipedia's article, which is pretty well cited, shows that:
0.00047 ppm or 0.47 ppb is the odor threshold, the point at which 50% of a human panel can detect the presence of an odor without being able to identify it.
This seems to be well below what's cited as a risk to health, but OSHA warns not to use smell as a means to detect it (OSHA.gov):
Can be smelled at low levels, but with continuous lowlevel exposure or at higher concentrations you lose your ability to smell the gas even though it is still present.
At high concentrations – your ability to smell the gas can be lost instantly.
DO NOT depend on your sense of smell for indicating the continuing presence of this gas or for warning of hazardous concentrations.
- What equipment is available today, and who has access to it? How much does it cost and what is its sensitivity/latency? How much does it weigh and how does it work (air grab sample, continuous flow, soil sample?)
- Are there alternative means of detecting which are dramatically different/cheaper?
- silver film tarnishes with exposure to H2S, some sources cite discolored copper coins in someone's pocket as a way to diagnose a high exposure
Health effects
Health effects vary with how long, and at what level, you are exposed. Asthmatics may be at greater risk.
Low concentrations – irritation of eyes, nose, throat, or respiratory system; effects can be delayed.
Moderate concentrations – more severe eye and respiratory effects, headache, dizziness, nausea, coughing, vomiting and difficulty breathing.
High concentrations – shock, convulsions, unable to breathe, coma, death; effects can be extremely rapid (within a few breaths).
(Exposure information from OSHA.gov)
Exposure limits from various sources, from an Airgas Materials Safety Data Sheet:
ACGIH TLV (United States, 3/2016).
STEL: 5 ppm 15 minutes.
TWA: 1 ppm 8 hours.
NIOSH REL (United States, 10/2013).
CEIL: 15 mg/m³ 10 minutes.
CEIL: 10 ppm 10 minutes.
OSHA PEL 1989 (United States, 3/1989).
STEL: 21 mg/m³ 15 minutes.
STEL: 15 ppm 15 minutes.
TWA: 14 mg/m³ 8 hours.
TWA: 10 ppm 8 hours.
OSHA PEL Z2 (United States, 2/2013).
AMP: 50 ppm 10 minutes.
CEIL: 20 ppm
Note that these show toxicity at levels close to the ability of the wearable electronic monitors (see above) can detect -- 10-15ppm; "STEL" means Short Term Exposure Limit, or an "acceptable average exposure over a short period of time."
Questions
Please ask questions to help us expand this set of resources:
[questions:h2s]
Existing work on Public Lab.org
A range of projects related to H2S have been developed here over the years; we're going to try to organize it better, but for now:
[notes:h2s]
|
Revert |
|
28
|
warren |
May 09, 2017 21:21
| over 7 years ago
A draft page for collecting and organizing information, questions, and projects related to hydrogen sulfide.
Hydrogen sulfide is a colorless, flammable, extremely hazardous gas with a “rotten egg” smell. It occurs naturally in crude petroleum and natural gas, and can be produced by the breakdown of organic matter and human/ animal wastes (e.g., sewage). It is heavier than air and can collect in low-lying and enclosed, poorly ventilated areas such as basements, manholes, sewer lines and underground telephone/electrical vaults. (via OSHA.gov)
Framing the problem
- Where is this an issue?
- Who's working on this already?
- What information is missing, if any? How will it change the situation?
- What are they key parameters:
- What intensities & exposure times are harmful to humans or the environment?
- Where and how can it be detected? by smell range?
- How long does it take to detect?
- How fast does it move/change, or how large an area does it affect?
- What kind of detection? presence/absence? direction of flow? intensity or locating a spot source?
- What should the output data look like? Graphs, logs, lights, images?
- What are the data’s uses/outcomes? Legal? Avoidance? Remediation? Regulation?
Detecting H2S
Wikipedia's article, which is pretty well cited, shows that:
0.00047 ppm or 0.47 ppb is the odor threshold, the point at which 50% of a human panel can detect the presence of an odor without being able to identify it.
This seems to be well below what's cited as a risk to health, but OSHA warns not to use smell as a means to detect it (OSHA.gov):
Can be smelled at low levels, but with continuous lowlevel exposure or at higher concentrations you lose your ability to smell the gas even though it is still present.
At high concentrations – your ability to smell the gas can be lost instantly.
DO NOT depend on your sense of smell for indicating the continuing presence of this gas or for warning of hazardous concentrations.
- What equipment is available today, and who has access to it? How much does it cost and what is its sensitivity/latency? How much does it weigh and how does it work (air grab sample, continuous flow, soil sample?)
- Are there alternative means of detecting which are dramatically different/cheaper?
- silver film tarnishes with exposure to H2S, some sources cite discolored copper coins in someone's pocket as a way to diagnose a high exposure
Health effects
Health effects vary with how long, and at what level, you are exposed. Asthmatics may be at greater risk.
Low concentrations – irritation of eyes, nose, throat, or respiratory system; effects can be delayed.
Moderate concentrations – more severe eye and respiratory effects, headache, dizziness, nausea, coughing, vomiting and difficulty breathing.
High concentrations – shock, convulsions, unable to breathe, coma, death; effects can be extremely rapid (within a few breaths).
(Exposure information from OSHA.gov)
Exposure limits from various sources, from an Airgas Materials Safety Data Sheet:
ACGIH TLV (United States, 3/2016).
STEL: 5 ppm 15 minutes.
TWA: 1 ppm 8 hours.
NIOSH REL (United States, 10/2013).
CEIL: 15 mg/m³ 10 minutes.
CEIL: 10 ppm 10 minutes.
OSHA PEL 1989 (United States, 3/1989).
STEL: 21 mg/m³ 15 minutes.
STEL: 15 ppm 15 minutes.
TWA: 14 mg/m³ 8 hours.
TWA: 10 ppm 8 hours.
OSHA PEL Z2 (United States, 2/2013).
AMP: 50 ppm 10 minutes.
CEIL: 20 ppm
Note that these show toxicity at levels close to the ability of the wearable electronic monitors (see above) can detect -- 10-15ppm; "STEL" means Short Term Exposure Limit, or an "acceptable average exposure over a short period of time."
Questions
Please ask questions to help us expand this set of resources:
[questions:h2s]
Existing work on Public Lab.org
A range of projects related to H2S have been developed here over the years; we're going to try to organize it better, but for now:
[notes:h2s]
|
Revert |
|
27
|
warren |
May 09, 2017 21:19
| over 7 years ago
A draft page for collecting and organizing information, questions, and projects related to hydrogen sulfide.
Hydrogen sulfide is a colorless, flammable, extremely hazardous gas with a “rotten egg” smell. It occurs naturally in crude petroleum and natural gas, and can be produced by the breakdown of organic matter and human/ animal wastes (e.g., sewage). It is heavier than air and can collect in low-lying and enclosed, poorly ventilated areas such as basements, manholes, sewer lines and underground telephone/electrical vaults. (via OSHA.gov)
Framing the problem
- Where is this an issue?
- Who's working on this already?
- What information is missing, if any? How will it change the situation?
- What are they key parameters:
- What intensities & exposure times are harmful to humans or the environment?
- Where and how can it be detected? by smell range?
- How long does it take to detect?
- How fast does it move/change, or how large an area does it affect?
- What kind of detection? presence/absence? direction of flow? intensity or locating a spot source?
- What should the output data look like? Graphs, logs, lights, images?
- What are the data’s uses/outcomes? Legal? Avoidance? Remediation? Regulation?
Detecting H2S
Wikipedia's article, which is pretty well cited, shows that:
0.00047 ppm or 0.47 ppb is the odor threshold, the point at which 50% of a human panel can detect the presence of an odor without being able to identify it.
This seems to be well below what's cited as a risk to health, but OSHA warns not to use smell as a means to detect it (OSHA.gov):
Can be smelled at low levels, but with continuous lowlevel exposure or at higher concentrations you lose your ability to smell the gas even though it is still present.
At high concentrations – your ability to smell the gas can be lost instantly.
DO NOT depend on your sense of smell for indicating the continuing presence of this gas or for warning of hazardous concentrations.
- What equipment is available today, and who has access to it? How much does it cost and what is its sensitivity/latency? How much does it weigh and how does it work (air grab sample, continuous flow, soil sample?)
- Are there alternative means of detecting which are dramatically different/cheaper?
- silver film tarnishes with exposure to H2S, some sources cite discolored copper coins in someone's pocket as a way to diagnose a high exposure
Health effects
Health effects vary with how long, and at what level, you are exposed. Asthmatics may be at greater risk.
Low concentrations – irritation of eyes, nose, throat, or respiratory system; effects can be delayed.
Moderate concentrations – more severe eye and respiratory effects, headache, dizziness, nausea, coughing, vomiting and difficulty breathing.
High concentrations – shock, convulsions, unable to breathe, coma, death; effects can be extremely rapid (within a few breaths).
(Exposure information from OSHA.gov)
Exposure limits from various sources, from an Airgas Materials Safety Data Sheet:
ACGIH TLV (United States, 3/2016).
STEL: 5 ppm 15 minutes.
TWA: 1 ppm 8 hours.
NIOSH REL (United States, 10/2013).
CEIL: 15 mg/m³ 10 minutes.
CEIL: 10 ppm 10 minutes.
OSHA PEL 1989 (United States, 3/1989).
STEL: 21 mg/m³ 15 minutes.
STEL: 15 ppm 15 minutes.
TWA: 14 mg/m³ 8 hours.
TWA: 10 ppm 8 hours.
OSHA PEL Z2 (United States, 2/2013).
AMP: 50 ppm 10 minutes.
CEIL: 20 ppm
Note that these show toxicity at levels close to the ability of the wearable electronic monitors (see above) can detect -- 10-15ppm; "STEL" means Short Term Exposure Limit, or an "acceptable average exposure over a short period of time."
Questions
[questions:h2s]
Existing work on Public Lab.org
[notes:h2s]
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Revert |
|
26
|
warren |
May 09, 2017 21:14
| over 7 years ago
A draft page for collecting and organizing information, questions, and projects related to hydrogen sulfide.
Hydrogen sulfide is a colorless, flammable, extremely hazardous gas with a “rotten egg” smell. It occurs naturally in crude petroleum and natural gas, and can be produced by the breakdown of organic matter and human/ animal wastes (e.g., sewage). It is heavier than air and can collect in low-lying and enclosed, poorly ventilated areas such as basements, manholes, sewer lines and underground telephone/electrical vaults. (via OSHA.gov)
Framing the problem
- Where is this an issue?
- Who's working on this already?
- What information is missing, if any? How will it change the situation?
- What are they key parameters:
- What intensities & exposure times are harmful to humans or the environment?
- Where and how can it be detected? by smell range?
- How long does it take to detect?
- How fast does it move/change, or how large an area does it affect?
- What kind of detection? presence/absence? direction of flow? intensity or locating a spot source?
- What should the output data look like? Graphs, logs, lights, images?
- What are the data’s uses/outcomes? Legal? Avoidance? Remediation? Regulation?
Techniques for detecting H2S
- What equipment is available today, and who has access to it? How much does it cost and what is its sensitivity/latency? How much does it weigh and how does it work (air grab sample, continuous flow, soil sample?)
- Are there alternative means of detecting which are dramatically different/cheaper?
- silver film tarnishes with exposure to H2S, some sources cite discolored copper coins in someone's pocket as a way to diagnose a high exposure
Background
Detection by Smell
Can be smelled at low levels, but with continuous lowlevel exposure or at higher concentrations you lose your ability to smell the gas even though it is still present.
At high concentrations – your ability to smell the gas can be lost instantly.
DO NOT depend on your sense of smell for indicating the continuing presence of this gas or for warning of hazardous concentrations.
Health Effects
Health effects vary with how long, and at what level, you are exposed. Asthmatics may be at greater risk.
Low concentrations – irritation of eyes, nose, throat, or respiratory system; effects can be delayed.
Moderate concentrations – more severe eye and respiratory effects, headache, dizziness, nausea, coughing, vomiting and difficulty breathing.
High concentrations – shock, convulsions, unable to breathe, coma, death; effects can be extremely rapid (within a few breaths).
(Exposure information from OSHA.gov)
Exposure limits from various sources, from an Airgas Materials Safety Data Sheet:
ACGIH TLV (United States, 3/2016).
STEL: 5 ppm 15 minutes.
TWA: 1 ppm 8 hours.
NIOSH REL (United States, 10/2013).
CEIL: 15 mg/m³ 10 minutes.
CEIL: 10 ppm 10 minutes.
OSHA PEL 1989 (United States, 3/1989).
STEL: 21 mg/m³ 15 minutes.
STEL: 15 ppm 15 minutes.
TWA: 14 mg/m³ 8 hours.
TWA: 10 ppm 8 hours.
OSHA PEL Z2 (United States, 2/2013).
AMP: 50 ppm 10 minutes.
CEIL: 20 ppm
Note that these show toxicity at levels close to the ability of the wearable electronic monitors (see above) can detect -- 10-15ppm; "STEL" means Short Term Exposure Limit, or an "acceptable average exposure over a short period of time."
Questions
[questions:h2s]
Existing work on Public Lab.org
[notes:h2s]
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Revert |
|
25
|
warren |
May 09, 2017 19:01
| over 7 years ago
Hydrogen Sulfide, or H2S, is
Framing the problem
- Where is this an issue?
- Who's working on this already?
- What information is missing, if any? How will it change the situation?
- What are they key parameters:
- What intensities & exposure times are harmful to humans or the environment?
- Where and how can it be detected? by smell range?
- How long does it take to detect?
- How fast does it move/change, or how large an area does it affect?
- What kind of detection? presence/absence? direction of flow? intensity or locating a spot source?
- What equipment is available today, and who has access to it? How much does it cost and what is its sensitivity/latency? How much does it weigh and how does it work (air grab sample, continuous flow, soil sample?)
- What should the output data look like? Graphs, logs, lights, images?
- What are the data’s uses/outcomes? Legal? Avoidance? Remediation? Regulation?
- Are there alternative means of detecting which are dramatically different/cheaper?
- silver film tarnishes with exposure to H2S, some sources cite discolored copper coins in someone's pocket as a way to diagnose a high exposure
Background
Hydrogen sulfide is a colorless, flammable, extremely hazardous gas with a “rotten egg” smell. It occurs naturally in crude petroleum and natural gas, and can be produced by the breakdown of organic matter and human/ animal wastes (e.g., sewage). It is heavier than air and can collect in low-lying and enclosed, poorly ventilated areas such as basements, manholes, sewer lines and underground telephone/electrical vaults.
Detection by Smell
Can be smelled at low levels, but with continuous lowlevel exposure or at higher concentrations you lose your ability to smell the gas even though it is still present.
At high concentrations – your ability to smell the gas can be lost instantly.
DO NOT depend on your sense of smell for indicating the continuing presence of this gas or for warning of hazardous concentrations.
Health Effects
Health effects vary with how long, and at what level, you are exposed. Asthmatics may be at greater risk.
Low concentrations – irritation of eyes, nose, throat, or respiratory system; effects can be delayed.
Moderate concentrations – more severe eye and respiratory effects, headache, dizziness, nausea, coughing, vomiting and difficulty breathing.
High concentrations – shock, convulsions, unable to breathe, coma, death; effects can be extremely rapid (within a few breaths).
(Exposure information from OSHA.gov)
Exposure limits from various sources, from a Materials Safety Data Sheet:
ACGIH TLV (United States, 3/2016).
STEL: 5 ppm 15 minutes.
TWA: 1 ppm 8 hours.
NIOSH REL (United States, 10/2013).
CEIL: 15 mg/m³ 10 minutes.
CEIL: 10 ppm 10 minutes.
OSHA PEL 1989 (United States, 3/1989).
STEL: 21 mg/m³ 15 minutes.
STEL: 15 ppm 15 minutes.
TWA: 14 mg/m³ 8 hours.
TWA: 10 ppm 8 hours.
OSHA PEL Z2 (United States, 2/2013).
AMP: 50 ppm 10 minutes.
CEIL: 20 ppm
Questions
[questions:h2s]
Existing work on Public Lab.org
[notes:h2s]
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Revert |
|
24
|
warren |
May 09, 2017 18:56
| over 7 years ago
Hydrogen Sulfide, or H2S, is
Framing the problem
- Where is this an issue?
- Who's working on this already?
- What information is missing, if any? How will it change the situation?
- What are they key parameters:
- What intensities & exposure times are harmful to humans or the environment?
- http://publiclab.org/notes/warren/9-6-2011/hydrogen-sulfide-detection-fart-detector
- where can it be detected? by smell range?
- how long does it take?
- how fast does it move/change, or how large an area does it affect?
- what kind of detection? presence/absence? direction of flow? intensity or spot source?
- what equipment is available today, and who has access to it? How much does it cost and what is its sensitivity/latency? How much does it weigh and how does it work (air grab sample, continuous flow, soil sample?)
- who are the potential users? What should the output data look like? Graphs, logs, lights, images?
- what are the data’s uses/outcomes? Legal? Avoidance? Remediation? Regulation?
- are there alternative means of detecting which are dramatically different/cheaper?
- silver film tarnishes with exposure to H2S (see attached PDF)
Background
Hydrogen sulfide is a colorless, flammable, extremely hazardous gas with a “rotten egg” smell. It occurs naturally in crude petroleum and natural gas, and can be produced by the breakdown of organic matter and human/ animal wastes (e.g., sewage). It is heavier than air and can collect in low-lying and enclosed, poorly ventilated areas such as basements, manholes, sewer lines and underground telephone/electrical vaults.
Detection by Smell
Can be smelled at low levels, but with continuous lowlevel exposure or at higher concentrations you lose your ability to smell the gas even though it is still present.
At high concentrations – your ability to smell the gas can be lost instantly.
DO NOT depend on your sense of smell for indicating the continuing presence of this gas or for warning of hazardous concentrations.
Health Effects
Health effects vary with how long, and at what level, you are exposed. Asthmatics may be at greater risk.
Low concentrations – irritation of eyes, nose, throat, or respiratory system; effects can be delayed.
Moderate concentrations – more severe eye and respiratory effects, headache, dizziness, nausea, coughing, vomiting and difficulty breathing.
High concentrations – shock, convulsions, unable to breathe, coma, death; effects can be extremely rapid (within a few breaths).
(Exposure information from OSHA.gov)
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23
|
warren |
September 21, 2011 22:36
| over 13 years ago
An organization page for RISD-led grassroots detection of H2S research.
Google Doc
Framing the problem
- where is the issue located? how can we get there and with whom do we collaborate?
- https://www.flickr.com/photos/recordandremember/6151719485/in/set-72157627674148174
- what is the information that’s missing? How will it change the situation?
- what are they key parameters:
- what intensities & exposure times are harmful to humans or the environment?
- http://publiclaboratory.org/notes/warren/9-6-2011/hydrogen-sulfide-detection-fart-detector
- where can it be detected? by smell range?
- how long does it take?
- how fast does it move/change, or how large an area does it affect?
- what kind of detection? presence/absence? direction of flow? intensity or spot source?
- what equipment is available today, and who has access to it? How much does it cost and what is its sensitivity/latency? How much does it weigh and how does it work (air grab sample, continuous flow, soil sample?)
- Google Shopping - as low as $109
- who are the potential users? What should the output data look like? Graphs, logs, lights, images?
- what are the data’s uses/outcomes? Legal? Avoidance? Remediation? Regulation?
- are there alternative means of detecting which are dramatically different/cheaper?
- silver film tarnishes with exposure to H2S (see attached PDF)
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22
|
warren |
September 21, 2011 22:34
| over 13 years ago
An organization page for RISD-led grassroots detection of H2S research.
Google Doc
Framing the problem
- where is the issue located? how can we get there and with whom do we collaborate?
- https://www.flickr.com/photos/recordandremember/6151719485/in/set-72157627674148174
- what is the information that’s missing? How will it change the situation?
- what are they key parameters:
- what intensities & exposure times are harmful to humans or the environment?
- http://publiclaboratory.org/notes/warren/9-6-2011/hydrogen-sulfide-detection-fart-detector
- where can it be detected? by smell range?
- how long does it take?
- how fast does it move/change, or how large an area does it affect?
- what kind of detection? presence/absence? direction of flow? intensity or spot source?
- what equipment is available today, and who has access to it? How much does it cost and what is its sensitivity/latency? How much does it weigh and how does it work (air grab sample, continuous flow, soil sample?)
- Google Shopping - as low as $109
- who are the potential users? What should the output data look like? Graphs, logs, lights, images?
- what are the data’s uses/outcomes? Legal? Avoidance? Remediation? Regulation?
- are there alternative means of detecting which are dramatically different/cheaper?
- silver film tarnishes with exposure to H2S
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21
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warren |
September 21, 2011 21:30
| over 13 years ago
An organization page for RISD-led grassroots detection of H2S research.
Google Doc
Framing the problem
Let’s try this for Hydrogen Sulfide
- where is the issue located? how can we get there and with whom do we collaborate?
- what is the information that’s missing? How will it change the situation?
- what are they key parameters:
- what intensities & exposure times are harmful to humans or the environment?
- where can it be detected?
- how long does it take?
- how fast does it move/change, or how large an area does it affect?
- what kind of detection? presence/absence? direction of flow? intensity or spot source?
- what equipment is available today, and who has access to it? How much does it cost and what is its sensitivity/latency? How much does it weigh and how does it work (air grab sample, continuous flow, soil sample?)
- who are the potential users? What should the output data look like? Graphs, logs, lights, images?
- what are the data’s uses/outcomes? Legal? Avoidance? Remediation? Regulation?
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warren |
September 21, 2011 21:24
| over 13 years ago
An organization page for RISD-led grassroots detection of H2S research.
Google Doc
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