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gretchengehrke 315 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.



Copper Sheet Hydrogen Sulfide Detection Activity

by gretchengehrke 18 days ago | 0 | 86 | 0

_This activity is an attempt to use Lionel Milberger's [copper rod hydrogen sulfide detection me...

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Hydrogen sulfide badges by Morphix Technologies

by gretchengehrke 2 months ago | 1 | 108 | 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 3 months ago | 3 | 98 | 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 9 months ago | 0 | 132 | 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 9 months ago | 2 | 212 | 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 about 1 year ago | 1 | 436 | 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 about 1 year ago | 3 | 504 | 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 about 1 year ago | 2 | 441 | 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 about 1 year ago | 1 | 633 | 2

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 | 490 | 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 | 578 | 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 about 2 years ago | 3 | 1,748 | 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 about 2 years ago | 11 | 2,901 | 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 about 2 years ago | 6 | 2,026 | 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 | 1,333 | 4

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

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Community Mapping to Reevaluate Space in a Refugee Camp

by gretchengehrke about 2 years ago | 0 | 3,191 | 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 over 2 years ago | 0 | 2,503 | 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 over 2 years ago | 8 | 1,924 | 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 over 2 years ago | 2 | 1,966 | 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 over 2 years ago | 2 | 1,233 | 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 almost 3 years ago | 4 | 1,955 | 2

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

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When is it better to do grab sampling versus other types of monitoring?

Accepted

stevie asked about about 1 month ago

Answers by gretchengehrke

How does the EPA measure things, especially the size of dust particles?

kgradow1 asked about about 1 month ago

Answers by gretchengehrke

Who is developing smart-form?

liz asked about about 1 month ago

Answers by gretchengehrke

Natural Disinfectant

Mempet asked about 3 months ago

Answers by gretchengehrke

Water Filter Effectiveness

Mempet asked about 3 months ago

Answers by gretchengehrke

What do the terms attainment and nonattainment mean?

Accepted

liz asked about 4 months ago

Answers by gretchengehrke

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

gretchengehrke asked about 4 months 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 5 months ago

Answers by gretchengehrke

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

liz asked about about 1 year 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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