gretchengehrke 56 research notes and 290 wiki edits | Joined over 4 years ago
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.
24 questions asked
24 answers posted
6 activities posted
0 activities attempted
Can MiniVol (TAS Particulate Matter Monitor) measure Black Carbon or Elemental Carbon?
stevie asked about about 1 year ago
What is a good resource for learning about chemical and toxicological information?
gretchengehrke asked about about 1 year ago
answered on Mar 21, 2018 2
Show all 1 answers »How do I do website change detection and notification?
Accepted
cfastie asked about about 1 year ago
The difference between medical particle monitoring and your particle monitoring?
Accepted
Ag8n asked about about 1 year ago
answered on Mar 06, 2018 0
Show all 1 answers »What are good humidity sensor/monitors to use with gas sampling kits?
Accepted
gretchengehrke asked about over 1 year ago
Formaldehyde levels
Ag8n asked about over 1 year ago
answered on Jan 16, 2018 1
Show all 1 answers »Can you use rubbing alcohol or nail polish remover for prepping copper for Hydrogen Sulfide test?
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zengirl2 asked about over 1 year ago
answered on Nov 30, 2017 1
answered on Dec 06, 2017 0
answered on Jan 22, 2018 0
answered on Mar 09, 2018 0
Show all 4 answers »Does Pennsylvania have air quality standards for hydrogen sulfide?
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gretchengehrke asked about over 1 year ago
answered on Nov 30, 2017 0
Show all 1 answers »Are there occupational exposure rules limiting exposure to hydrogen sulfide?
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gretchengehrke asked about over 1 year ago
answered on Nov 30, 2017 0
Show all 1 answers »Are there air quality standards for hydrogen sulfide?
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gretchengehrke asked about over 1 year ago
answered on Nov 30, 2017 0
Show all 1 answers »How to select a site for hydrogen sulfide testing?
warren asked about over 1 year ago
answered on Nov 28, 2017 0
answered on Nov 30, 2017 0
answered on Dec 04, 2017 0
Show all 3 answers »When is it better to do grab sampling versus other types of monitoring?
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stevie asked about over 1 year ago
answered on Oct 11, 2017 0
Show all 1 answers »How does the EPA measure things, especially the size of dust particles?
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kgradow1 asked about over 1 year ago
Who is developing smart-form?
liz asked about over 1 year ago
answered on Sep 26, 2017 0
Show all 1 answers »Where can someone send a strange substance found on their property for analysis?
bbutler asked about over 1 year ago
answered on Jan 30, 2018 0
Show all 1 answers »How do I collect a sample for laboratory analysis?
Accepted
warren asked about over 1 year ago
Natural Disinfectant
Mempet asked about over 1 year ago
answered on Sep 05, 2017 1
Show all 1 answers »What are soil sampling protocols being used by groups along the gulf coast?
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stevie asked about over 1 year ago
answered on Sep 05, 2017 0
answered on Sep 07, 2017 0
answered on Sep 07, 2017 0
answered on Jan 30, 2018 0
Show all 4 answers »What do the terms attainment and nonattainment mean?
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liz asked about almost 2 years ago
What is the best low-cost or DIY microscope to use with a group?
gretchengehrke asked about almost 2 years ago
What is your favorite program to plot data from a data logger?
gretchengehrke asked about almost 2 years ago
answered on Aug 03, 2017 0
answered on Aug 03, 2017 0
answered on Aug 04, 2017 0
answered on Aug 16, 2017 0
Show all 4 answers »Can commercially available water sensors work with DIY data loggers?
Accepted
gretchengehrke asked about almost 2 years ago
View these maps at MapKnitter.org »
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Comments
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| "Maxxam Labs can test for organic, elemental, and total carbon. It is a very different analysis than particulate matter or crystalline silica and re..." | Read more » | about 1 year ago | ||
| "Please note that this happens regardless of whether you click on the search auto-fill item that shows the tag symbol and that term (presumably mean..." | Read more » | about 1 year ago | ||
| "Hmm. This is surprising to me too. Iron-rich clay can readily adsorb arsenic under oxygen-rich conditions (this is actually the root of Bangladesh,..." | Read more » | about 1 year ago | ||
| "The EPA has created a comprehensive database for physical, chemical, and toxicological data for hundreds of thousands of chemicals: https://comptox..." | Read more » | about 1 year ago | ||
| "Hi @cfastie, I'm not sure when EDGI's software website monitoring software will be available for public use (our developers are working really hard..." | Read more » | about 1 year ago | ||
| "@liz, We wanted to go with the most eye-catching postcard so we could say, "Do you remember that bright green postcard from a couple of weeks ago."..." | Read more » | about 1 year ago | ||
| "@bronwen, We can only use black ink on colored paper. Good question about the file type... I think i might need to make it in this company's online..." | Read more » | about 1 year ago | ||
| "That is such a good idea, @Ag8n!! We should definitely try this. @sara, what would you think about trying this with copper strips that are colocate..." | Read more » | about 1 year ago | ||
| "Also, I just saw on comptox.epa.gov that acetone is actually more hydrophilic than isopropanol, which totally surprises me! I guess vapor pressure ..." | Read more » | about 1 year ago | ||
| "Either acetone or 99% isopropanol are probably fine, and maybe we should do a comparison. The only concern I see with isopropanol is that it has a ..." | Read more » | about 1 year ago | ||
| "Hi @Ag8n, with regards to the medical situation vs equipment, it sounds like the particle sizes they are measuring are relevant for (1) respiratory..." | Read more » | about 1 year ago | ||
| "Hi @Ag8n, Do you know what gmp facilities (good management practices, in case others are unfamiliar with the abbreviation) use for the 0.5 micron s..." | Read more » | about 1 year ago | ||
| "Also, its interesting that cristobalite is rounded. I will look in the literature to see if there is a relationship between cristobalite and silico..." | Read more » | about 1 year ago | ||
| "I'm glad you brought this up, @Ag8n! @Mathew did some work with polarimetry too. See this research note: https://publiclab.org/notes/mathew/05-21-2..." | Read more » | about 1 year ago | ||
| "Thank you so much, @Ag8n! This is exactly what I was hoping to see. I live near Duke University and can see if they have the books there too. Does ..." | Read more » | about 1 year ago | ||
| "We've been trying to use DIY microscopes to distinguish between crystalline and non-crystalline particulate matter. Of course we wouldn't be able t..." | Read more » | about 1 year ago | ||
| "Hi @Ag8n, Do you know how the aquarium TDS meter works? Maybe it really is just a super cheap conductivity meter? " | Read more » | over 1 year ago | ||
| "@programmer1200, This is great! I agree with Chris and Holger that light scattering at a 90-degree angle is the standard approach for turbidity, an..." | Read more » | over 1 year ago | ||
| "Here's another resource for soil sampling procedures: https://archive.epa.gov/region9/toxic/web/pdf/ee-soilsampling-sop-env-3-13.pdf. " | Read more » | over 1 year ago | ||
| "Here's a great resource for soil sampling. Section 8.3.2 gives a good start for a step-by-step protocol for surface soil sampling. Table 8.2 is sup..." | Read more » | over 1 year ago | ||
| "Table 8.2 in that doc is particularly useful. " | Read more » | over 1 year ago | ||
| "Here is a great reference document that helps parse out some different types of sampling for different study designs, depths of samples, etc. We co..." | Read more » | over 1 year ago | ||
| "Hi @bbutler, How did this turn out? Did you get it tested? Another thought is to go to a local state public health laboratory (general info about p..." | Read more » | over 1 year ago | ||
| "This one seems like it could be good if you were monitoring near somewhere with wireless: https://www.amazon.com/dp/B0013BKDO8/ref=asc_df_B0013BKDO..." | Read more » | over 1 year ago |
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.
gretchengehrke was awarded the Basic Barnstar by Noasdop for their work published in How do you find industrial WPDES permit details? .
