🎈 Public Lab: gretchengehrke

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Wiki pages recently contributed to

Formaldehyde updated about 6 hours ago by gretchengehrke
Building a Frac Sand Economic Assessment updated 16 days ago by gretchengehrke
Water Sensors updated about 1 month ago by stevie
General Environmental Monitoring Study Strategies updated 5 months ago by gretchengehrke
pDR-1500 updated 5 months ago by mathew
NPDES updated 7 months ago by warren

gretchengehrke 268 research notes and wiki edits | Admin

I'm the Data and Advocacy Steward with Public Lab, and am an avid environmentalist living in Durham, North Carolina. My background is in environmental geochemistry, and I am interested in the intersections and overlaps between environmental science and social justice. Joining Public Lab, I am looking forward to getting involved in environmental protection in a more tangible way.

Joined almost 3 years ago

Hydrogen sulfide badges by Morphix Technologies

by gretchengehrke 7 days ago | 0 | 57 views | 0

Hi Folks! I just found these hydrogen sulfide passive samplers that are made by Morphix Technolog...

Creating a guide for community science action planning: first steps

by gretchengehrke about 1 month ago | 3 | 69 views | 1

Over the next few months, we're hoping to put together an interactive resource for people to use ...

EPA Method 22: Visual Determination of Fugitive Emissions

by gretchengehrke 7 months ago | 0 | 96 views | 2

**EPA Method 22: Visual Determination of Fugitive Emissions from Material Sources and Smoke Emiss...

EPA Method 9: Visual Determination of the Opacity of Emissions from Stationary Sources

by gretchengehrke 7 months ago | 2 | 164 views | 5

This is a step by step guide to to assess the opacity of emissions, using EPA’s Method 9 “Visual...

Colorado Regulations Hotsheet

by gretchengehrke 11 months ago | 1 | 422 views | 5

As we start to work with community members in Colorado on issues emanating from oil and gas indus...

Thoughts on Method 9 and its utility

by gretchengehrke 11 months ago | 3 | 465 views | 5

Several people in our Public Lab community are concerned about various kinds of airborne emission...

Oil Testing Kit Beta Challenge

by gretchengehrke 11 months ago | 2 | 420 views | 1

_Image courtesy of _ This activity was developed for the [Oil Testing Kit Beta Challenge](...

Common low-cost technique limitations and strategies for impact

by gretchengehrke 12 months ago | 1 | 555 views | 1

With an environmental and environmental health focus, many people coming to Public Lab may be loo...

Activity Categories

by gretchengehrke about 1 year ago | 8 | 470 views | 3

A bunch of people here in our community are interested in making our collective work more organiz...

Oil Testing Kit -- Beta tests (with some needed re-dos)

by gretchengehrke almost 2 years ago | 3 | 568 views | 0

These are sets of spectra scanned using my Public Lab spectrometer and the oil samples provide...

Coal Ash and Citizen Monitoring

by gretchengehrke almost 2 years ago | 3 | 1,736 views | 4

Photo credit: Living on Earth, http://loe.org/content/2014-02-14/1-dan-river.jpg As a reside...

Formaldehyde Measurement: testing Public Lab's kit with DOH's equipment

by gretchengehrke almost 2 years ago | 11 | 2,877 views | 6

Formaldehyde is one of the most common indoor air pollutants, and is a known respiratory irrit...

Intended Purposes for Different Tools and Techniques

by gretchengehrke almost 2 years ago | 6 | 2,008 views | 11

(Note: have a better name for this? Please suggest it!) Environmental data can be used fo...

Photo Documentation of Turbid Waters for Advocacy

by gretchengehrke about 2 years ago | 2 | 1,313 views | 4

Photo credit: Bill Hughes If you encounter a discolored stream, taking a photograph an...

Community Mapping to Reevaluate Space in a Refugee Camp

by gretchengehrke about 2 years ago | 0 | 3,179 views | 2

image by Claudia Martinez Mansell _see related note: http://publiclab.org/notes/claudsmm/08...

Case Study: Ecological Assessment and Management using Balloon- and Kite-collected Aerial Images

by gretchengehrke about 2 years ago | 0 | 2,493 views | 4

This is Part 2 of an ongoing series of case studies by Gretchen Ge...

Case Study: Using Aerial Imagery to Pressure Industrial Polluters into Stormwater Compliance

by gretchengehrke about 2 years ago | 8 | 1,909 views | 2

This is Part 1 of an ongoing series of case studies by Gretchen Ge...

Oil Testing Kit -- mixing 5W30 20W30

by gretchengehrke about 2 years ago | 2 | 1,957 views | 1

Since the oils in the Oil Testing Kit 5W30 and 20W50 are distinguishable by their fluorescence s...

Oil Testing Kit -- discerning 5W30 20W30

by gretchengehrke about 2 years ago | 2 | 1,224 views | 2

I am taking spectra of the five oils in the Oil Testing Kit, and I forgot to label one of the cu...

Hydrocarbon standard samples for kits

by gretchengehrke over 2 years ago | 4 | 1,944 views | 2

Hi All, We have some questions for prepping the [Oil Testing Kits](http://publiclab.org/wiki/...

Asked Answered

What are the reaction rates of hydrogen sulfide with oxygen versus copper or silver?

asked by gretchengehrke 12 days ago | 0 | 45 | 0

question:air-quality question:question question:hydrogen-sulfide

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What are the relative rates of hydrogen sulfide oxidation in ambient air?

asked by gretchengehrke 12 days ago | 0 | 74 | 1

hydrogen-sulfide h2s question:air-quality question:question

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Methods for or experience measuring workplace hydrogen sulfide gas?

asked by gretchengehrke 28 days ago | 1 | 79 | 1

hydrogen-sulfide-sensing hydrogen-sulfide air-quality question:air-quality

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What is the best low-cost or DIY microscope to use with a group?

asked by gretchengehrke about 1 month ago | 0 | 88 | 0

question:microscopes

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How do you account for signal drift with sensors in the field?

asked by gretchengehrke about 1 month ago | 0 | 108 | 1

question:air-quality question:question question:water-quality question:sensors

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What is your favorite program to plot data from a data logger?

asked by gretchengehrke about 1 month ago | 0 | 108 | 1

question:general question:data-logging question:data-logger

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What kinds of data are best suited for raising public awareness? other goals?

asked by gretchengehrke about 1 month ago | 0 | 67 | 0

question:general

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Has anyone used ground glass joints in water sensor enclosures?

asked by gretchengehrke 2 months ago | 0 | 62 | 0

question:sensor-enclosures

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Can commercially available water sensors work with DIY data loggers?

Answered

asked by gretchengehrke 2 months ago | 0 | 119 | 1

question:data-logging question:water-sensors

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What information do I need to assess if a data logger and sensor will be compatible?

asked by gretchengehrke 2 months ago | 0 | 95 | 1

question:data-logging datalogging question:water-sensors water-sensors

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What do you do if your environmental concern is linked to your neighbor's paycheck?

asked by gretchengehrke 2 months ago | 2 | 93 | 1

question:question question:barnraising question:advocacy question:communication

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Do you know of environmental justice applications of remote sensing data?

asked by gretchengehrke 2 months ago | 0 | 65 | -1

question:question question:general question:barnraising question:remote-sensing

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Do you have resources on odor logs and odor reporting platforms?

Answered

asked by gretchengehrke 3 months ago | 0 | 56 | 0

question:air-quality question:odor question:smell

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Can we use a timelapse or video camera to monitor particulate air plumes?

asked by gretchengehrke about 1 year ago | 0 | 512 | 3

photo-monitoring timelapse with:warren question:timelapse

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Natural Disinfectant

Mempet asked about 16 days ago

Answers by gretchengehrke

answered on Sep 05, 2017 1

Show all 1 answers »

Water Filter Effectiveness

Mempet asked about 16 days ago

Answers by gretchengehrke

answered on Sep 05, 2017 1

Show all 1 answers »

What do the terms attainment and nonattainment mean?

Accepted

liz asked about about 1 month ago

Answers by gretchengehrke

answered on Aug 03, 2017 2

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What is the best low-cost or DIY microscope to use with a group?

gretchengehrke asked about about 1 month ago

Answers by gretchengehrke

answered on Aug 08, 2017 0

Show all 1 answers »

What is your favorite program to plot data from a data logger?

gretchengehrke asked about about 1 month ago

Answers by gretchengehrke

answered on Aug 03, 2017 0

answered on Aug 16, 2017 0

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Can commercially available water sensors work with DIY data loggers?

gretchengehrke asked about 2 months ago

Answers by gretchengehrke

answered on Jul 25, 2017 0

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Sensor: ORP versus PH

Accepted

MadTinker asked about 3 months ago

Answers by gretchengehrke

answered on Jul 05, 2017 1

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Are there any methods to distinguish where particulate matter in the air comes from?

Accepted

stevie asked about 4 months ago

Answers by gretchengehrke

answered on May 23, 2017 0

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What are important aspects to consider about replication on the website and in the community?

liz asked about 12 months ago

Answers by gretchengehrke

answered on Sep 29, 2016 1

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How can i know if my plant-based air filter is working?

liz asked about 12 months ago

Answers by gretchengehrke

answered on Sep 27, 2016 1

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Can we use a timelapse or video camera to monitor particulate air plumes?

gretchengehrke asked about about 1 year ago

Answers by gretchengehrke

answered on Oct 29, 2016 0

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Is CALPUFF a good air quality modeling tool

marlokeno asked about about 1 year ago

Answers by gretchengehrke

answered on Sep 22, 2016 0

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View these maps <a href='//mapknitter.org/profile/gretchengehrke'>at MapKnitter.org »</a>

Title	Creation date	Image

gretchengehrke was awarded the Basic Barnstar by warren for their work published in Case Study: Using Aerial Imagery to Pressure Industrial Polluters into Stormwater Compliance .

gretchengehrke was awarded the Basic Barnstar by warren for their work published in Intended Purposes for Different Tools and Techniques.

gretchengehrke was awarded the Basic Barnstar by stevie for their work published in EPA Method 9: Visual Determination of the Opacity of Emissions from Stationary Sources.