Comments

Author Comment Last activity Moderation
gretchengehrke "Agreed! " | Read more » almost 3 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 3 years ago
gretchengehrke "Hi @Ag8n, I just now responded to this question in your other question thread. The validation work is being conducted at BEESL at Syracuse Universi..." | Read more » about 3 years ago
gretchengehrke "hi @Ag8n, the validation work is being conducted by the Building Energy and Environmental Systems Laboratory at Syracuse University. The protocol i..." | Read more » about 3 years ago
gretchengehrke "@Ag8n, our goal is to have this system be less expensive and more sensitive than Draeger tubes. The pumps recommended for Draeger tubes are often v..." | Read more » about 3 years ago
gretchengehrke "Hi @pdhixenbaugh! This is great. Have you seen that there is an Open Hour on Data Loggers this Monday (12/4) at noon ET / 9am PT? Might you be free..." | Read more » about 3 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 3 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 3 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 3 years ago
gretchengehrke "There has also been a lot of turbulence in Michigan about deregulating for several years. This article has a quick rundown of some of it: https://g..." | Read more » about 3 years ago
gretchengehrke "Hi @gilbert, It looks like Wisconsin's state legislature is trying hard to deregulate! See this NPR article: https://www.wpr.org/wisconsin-lawmake..." | Read more » about 3 years ago
gretchengehrke "Yes! Pennsylvania is actually one of the few states that does have ambient air quality standards for hydrogen sulfide! Read more here: https://publ..." | Read more » about 3 years ago
gretchengehrke "Yes, OSHA does regulate workplace exposure to hydrogen sulfide. The OSHA "ceiling" exposure limit is 20 ppm, though NIOSH- the federal research ins..." | Read more » about 3 years ago
gretchengehrke "In the United States, hydrogen sulfide is not considered a "criteria pollutant" or a hazardous air pollutant. Thus, there are no federal ambient ai..." | Read more » about 3 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 3 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 3 years ago
gretchengehrke "Here is a picture of cutting the copper sheet into strips. " | Read more » about 3 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 3 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 3 years ago
gretchengehrke "I think we should distinguish between tags and topics. I think, while we still don't use the word "topic" widely on the site, we have the opportuni..." | Read more » about 3 years ago
gretchengehrke "@cfastie, I have those same questions too re: many tags, one wiki; one tag, many wikis. I'm hoping we can start creating primary wikis that are top..." | Read more » about 3 years ago
gretchengehrke "@eustatic, no worries -- Mathew got this pretty far (complete, perhaps?). The video is embedded in this page: https://publiclab.org/wiki/formaldehy..." | Read more » about 3 years ago
gretchengehrke "This is so cool! Thanks Liz! " | Read more » over 3 years ago
gretchengehrke "Hi Stevie, in my experience, it really depends on what the end goals are (e.g. assessing general/chronic conditions or synopses of specific conditi..." | Read more » over 3 years ago