| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| 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 » | almost 7 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 » | almost 7 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 » | almost 7 years ago | |||
| gretchengehrke | "@warren, I thought the sandpaper we used (that was like a polisher) worked well to remove grime on the surface of the copper, which is its purpose...." | Read more » | almost 7 years ago | |||
| gretchengehrke | "Hi @warren, "miscible" means it dissolves with them to create a homogenous mixture (i.e. doesn't separate out like oil and water do). Acetone is a ..." | Read more » | about 7 years ago | |||
| gretchengehrke | "The general principles discussed in this wiki would apply for hydrogen sulfide sampling too: https://publiclab.org/wiki/general-environmental-monit..." | Read more » | about 7 years ago | |||
| gretchengehrke | "@Zengirl2, I think for the best results you'll want to use acetone, which is easy to find online and in a lot of drug stores and art stores (and ma..." | Read more » | about 7 years ago | |||
| gretchengehrke | "Here are before and after photos. We did not expect (and did not observe) any discoloration since we were only putting them out for less than 24 ho..." | Read more » | about 7 years ago | |||
| gretchengehrke | "Here is a picture after sanding one of the little copper strips. The green pad is actually soft sandpaper / polishing paper. " | Read more » | about 7 years ago | |||
| gretchengehrke | "Here is a picture of cutting the copper sheet into strips. " | Read more » | about 7 years ago | |||
| gretchengehrke | "Hi @warren, Thanks for the reminder to add pictures. I have tried inserting photos a few times today, but it keeps crashing the edit (and, seemingl..." | Read more » | about 7 years ago | |||
| gretchengehrke | "Hi @Zengirl2, I'm not sure about the copper strips. Whatever copper is used needs to be fairly pure, and I'm not sure if the copper tape is pure c..." | Read more » | about 7 years ago | |||
| gretchengehrke | "There are a bunch of sensors commercially available through this vendor: https://www.grainger.com/category/ecatalog/N-1z0dwuc. Has anyone used one ..." | Read more » | over 7 years ago | |||
| gretchengehrke | "Hi Jack, Two quick thoughts: (1) Have you degassed your sulfuric acid too? For whatever reason, in my experience, H2SO4 takes longer to degas than..." | Read more » | almost 10 years ago |