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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.



Hydrogen sulfide badges by Morphix Technologies

by gretchengehrke 7 days ago | 0 | 57 | 0

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

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Creating a guide for community science action planning: first steps

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

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

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EPA Method 22: Visual Determination of Fugitive Emissions

by gretchengehrke 7 months ago | 0 | 96 | 2

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

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

by gretchengehrke 7 months ago | 2 | 164 | 5

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

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Colorado Regulations Hotsheet

by gretchengehrke 11 months ago | 1 | 422 | 5

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

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Thoughts on Method 9 and its utility

by gretchengehrke 11 months ago | 3 | 465 | 5

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

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Oil Testing Kit Beta Challenge

by gretchengehrke 11 months ago | 2 | 420 | 1

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

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Common low-cost technique limitations and strategies for impact

by gretchengehrke 12 months ago | 1 | 555 | 1

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

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Activity Categories

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

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

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

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

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

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Coal Ash and Citizen Monitoring

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

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

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

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

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

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Intended Purposes for Different Tools and Techniques

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

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

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Photo Documentation of Turbid Waters for Advocacy

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

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

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Community Mapping to Reevaluate Space in a Refugee Camp

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

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

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

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

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

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

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

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

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Oil Testing Kit -- mixing 5W30 20W30

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

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

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Oil Testing Kit -- discerning 5W30 20W30

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

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

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Hydrocarbon standard samples for kits

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

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

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Natural Disinfectant

Mempet asked about 16 days ago

Answers by gretchengehrke

Water Filter Effectiveness

Mempet asked about 16 days ago

Answers by gretchengehrke

What do the terms attainment and nonattainment mean?

Accepted

liz asked about about 1 month ago

Answers by gretchengehrke

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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Sensor: ORP versus PH

Accepted

MadTinker asked about 3 months ago

Answers by gretchengehrke

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

liz asked about 12 months ago

Answers by gretchengehrke

Is CALPUFF a good air quality modeling tool

marlokeno asked about about 1 year ago

Answers by gretchengehrke

answered on Sep 22, 2016 0

answered on Sep 22, 2016 0

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

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