Public Lab Wiki documentation

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?)
  • on Google Shopping - as low as $109 for 10-15ppm levels
• 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]

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?)
  • on Google Shopping - as low as $109 for 10-15ppm levels
• 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]

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?)
  • on Google Shopping - as low as $109 for 10-15ppm levels
• 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]

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?)
  • on Google Shopping - as low as $109 for 10-15ppm levels
• 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]

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?)
  • on Google Shopping - as low as $109 for 10-15ppm levels
• 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]

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?)
  • on Google Shopping - as low as $109 for 10-15ppm levels
• 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]

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?)
  • on Google Shopping - as low as $109 for 10-15ppm levels
• 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]

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?)
  • on Google Shopping - as low as $109 for 10-15ppm levels
• 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]

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?)
  • on Google Shopping - as low as $109 for 10-15ppm levels
• 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]

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?)
  • on Google Shopping - as low as $109 for 10-15ppm levels
• 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]

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?)
  • on Google Shopping - as low as $109 for 10-15ppm levels
• 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]

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?)
  • on Google Shopping - as low as $109 for 10-15ppm levels
• 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)

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)

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

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?

An organization page for RISD-led grassroots detection of H2S research.

Google Doc