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.







Net Neutrality: resources for action

by gretchengehrke over 1 year ago | 2 | 3,435 views | 2







Colorado Regulations Hotsheet

by gretchengehrke over 2 years ago | 1 | 118 views | 5



Oil Testing Kit Beta Challenge

by gretchengehrke over 2 years ago | 2 | 121 views | 1



Activity Categories

by gretchengehrke over 2 years ago | 8 | 217 views | 3



Coal Ash and Citizen Monitoring

by gretchengehrke over 3 years ago | 3 | 134 views | 4








Oil Testing Kit -- mixing 5W30 20W30

by gretchengehrke almost 4 years ago | 2 | 57 views | 1




'Smartphone App for Residential Testing of Formaldehyde' Paper published (Open Access)

by nshapiro 3 months ago | 5 | 207 views | 7

We're excited to announce that the exposure chamber validation and field test of our open-source ...

Read more


What happens when the mining stops? Focus on Reclamation

by mlamadrid almost 3 years ago | 0 | 150 views | 1

Article by Gretchen Gehrke, [Mathew Lippincott](h...

Read more


Determining wind direction with a kite and compass

by mathew about 2 years ago | 2 | 384 views | 2

During [PM hotspot monitoring](https://publiclab.org/notes/mathew/04-28-2017/practicing-a-pm-hots...

Read more


Refining the user interface of a community science app

by nshapiro over 1 year ago | 5 | 211 views | 3

Smartphone App for Residential Testing of Formaldehyde (SmART-Form) The [SmART-Form project]...

Read more



Formaldehyde Monitoring Open Call on Tuesday, January 16th at 3:00 pm ET

by nshapiro over 1 year ago | 1 | 554 views | 1

Hi Everyone, We are hosting an Open Call on Tuesday, January 16th at 3:00 pm ET, to discuss an o...

Read more


Silver Linings of Community Science

by mlamadrid over 1 year ago | 0 | 150 views | 0

Article by Gretchen Gehrke, Public Lab for [Commu...

Read more


How is the changing environmental governance landscape affecting YOUR work?

by mlamadrid over 1 year ago | 0 | 131 views | 0

Article by Public Lab Staff for [Community Science Forum: Changing Environmental Governance Lands...

Read more


how open data practices help science research

by liz over 1 year ago | 0 | 271 views | 1

lead image from https://www.nature.com/articles/s41559-017-0160 Posting an interesting article...

Read more



Draft: Collect a sample for laboratory analysis

by warren over 1 year ago | 2 | 443 views | 2

This is a draft, adapted from the DIY Oil Testing guide, authored wi...

Read more


Smartphone App for Residential Testing of Formaldehyde (SMART-FORM) Interim report

by nshapiro over 1 year ago | 6 | 400 views | 2

Below is the interum report of the NSF-funded SMART-FORM project, lead by Karen Dannemiller of Oh...

Read more


Practicing a PM hotspot survey in New Auburn, WI

by mathew about 2 years ago | 6 | 462 views | 2

Attempting a Hotspot survey in New Auburn, WI with: @Stevie, @Gretchen, @Warren, @marlokeno, Jonn...

Read more


Site Survey for a Minivol

by mathew about 2 years ago | 0 | 468 views | 1

Heather and Bruce Andersen live in Bloomer, Wisconsin, and want to setup a [MiniVol to identify d...

Read more



Pollutant Discharge Permits

by mlamadrid over 2 years ago | 0 | 181 views | 0

Article by Gretchen Gehrke for [Community Science...

Read more



Public Lab awarded NSF funding to help develop low-cost community formaldehyde monitoring technique

by nshapiro over 2 years ago | 2 | 271 views | 5

(Header image: A woman in Oklahoma attempts to document formaldehyde's effects on her son with he...

Read more


What goes into choosing a topic name?

by liz over 2 years ago | 2 | 140 views | 3

_above: sketch of figuring out how to organize "air" into a research area, and which methods are ...

Read more



What makes a good activity?

by warren over 2 years ago | 13 | 512 views | 3

In our continuing shift towards using the new Q&A feature and the new Activity grids as a framewo...

Read more


The many types of evidence

by warren over 2 years ago | 16 | 108 views | 2

As a followup to our [introductory post](https://publiclab.org/notes/warren/08-18-2016/introducin...

Read more


Q&A enables automated FAQ

by liz over 2 years ago | 0 | 123 views | 1

Asking and answering questions is at the very heart of Public Lab. It's how we get started, it's ...

Read more


Check out these Activity Grids

by liz over 2 years ago | 9 | 287 views | 8

The sheer number of posts on publiclab.org by contributors from all over the world about 1) h...

Read more



Introducing the Environmental Evidence Project, a blog series from Public Lab

by warren almost 3 years ago | 7 | 512 views | 7

Hello everyone -- Jeff Warren and Gretchen Gehrke here, Public Lab's Research Director and Data Q...

Read more


Plant Air Remediation Field Test #2 (Georgia)

by nshapiro almost 3 years ago | 6 | 594 views | 5

This post is in collaboration with the community science practitioners of Silent Disaster, a g...

Read more


Documenting Runoff with Photography

by mlamadrid almost 3 years ago | 0 | 175 views | 0

Article by Gretchen Gehrke for [Community Science...

Read more


Airborne Silica and Regulations

by mlamadrid almost 3 years ago | 0 | 377 views | 0

Article by Gretchen Gehrke for [Community Science...

Read more











How do I do website change detection and notification?

Accepted

cfastie asked about about 1 year ago

Answers

answered on Mar 20, 2018 0

answered on Mar 21, 2018 0

Show all 2 answers »

Formaldehyde levels

Ag8n asked about over 1 year ago

Answers


How to select a site for hydrogen sulfide testing?

warren asked about over 1 year ago

Answers

answered on Nov 28, 2017 0

answered on Nov 30, 2017 0

answered on Dec 04, 2017 0

Show all 3 answers »

Who is developing smart-form?

liz asked about over 1 year ago

Answers

How do I collect a sample for laboratory analysis?

Accepted

warren asked about over 1 year ago

Answers

answered on Sep 07, 2017 0

answered on Jan 30, 2018 0

Show all 2 answers »

Natural Disinfectant

Mempet asked about over 1 year ago

Answers

Water Filter Effectiveness

Mempet asked about over 1 year ago

Answers

answered on Sep 05, 2017 1

answered on Dec 04, 2017 0

Show all 2 answers »

What are soil sampling protocols being used by groups along the gulf coast?

Accepted

stevie asked about over 1 year ago

Answers

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?

Accepted

liz asked about almost 2 years ago

Answers

answered on Aug 03, 2017 0

answered on Aug 03, 2017 2

Show all 2 answers »

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

gretchengehrke asked about almost 2 years ago

Answers

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 »

Sensor: ORP versus PH

Accepted

MadTinker asked about almost 2 years ago

Answers

answered on Jul 05, 2017 1

answered on Jul 05, 2017 0

Show all 2 answers »

View these maps at MapKnitter.org »

Title Creation date Image

Comments

Comment Last activity Moderation
"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































Tags

Tags organize our knowledge base. Click to learn more or subscribe to a topic.



RSS feed for gretchengehrke


Wiki pages recently contributed to