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Comments

Author Comment Last activity Moderation
gretchengehrke "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 » over 2 years ago
gretchengehrke "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 » over 2 years ago
gretchengehrke "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 » over 2 years ago
gretchengehrke "The EPA has created a comprehensive database for physical, chemical, and toxicological data for hundreds of thousands of chemicals: https://comptox..." | Read more » over 2 years ago
gretchengehrke "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 » over 2 years ago
gretchengehrke "@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 » over 2 years ago
gretchengehrke "@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 » over 2 years ago
gretchengehrke "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 » over 2 years ago
gretchengehrke "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 » over 2 years ago
gretchengehrke "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 » over 2 years ago
gretchengehrke "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 » over 2 years ago
gretchengehrke "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 » over 2 years ago
gretchengehrke "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 » almost 3 years ago
gretchengehrke "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 » almost 3 years ago
gretchengehrke "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 » almost 3 years ago
gretchengehrke "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 » almost 3 years ago
gretchengehrke "Hi @Ag8n, Do you know how the aquarium TDS meter works? Maybe it really is just a super cheap conductivity meter? " | Read more » almost 3 years ago
gretchengehrke "@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 » almost 3 years ago
gretchengehrke "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 » almost 3 years ago
gretchengehrke "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 » almost 3 years ago
gretchengehrke "Table 8.2 in that doc is particularly useful. " | Read more » almost 3 years ago
gretchengehrke "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 » almost 3 years ago
gretchengehrke "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 » almost 3 years ago
gretchengehrke "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 » almost 3 years ago