| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| warren | "Just to clarify, #NPDES is the National Pollutant Discharge Elimination System " | Read more » | over 7 years ago | |||
| stevie | "Yes! You can read about NPDES permit exemptions on this page "There are highly consequential exemptions listed in Section 402(l) of the Clean Wate..." | Read more » | over 7 years ago | |||
| stevie | "You can read about this on the NPDES wiki here. "There are two kinds of permits issued under NPDES: individual and general. Individual permits are..." | Read more » | over 7 years ago | |||
| gbathree | "Hmmm... those are interesting! Actually in further discussion here we came to a similar idea that if the filter/carbon/whatever filled up with mat..." | Read more » | about 8 years ago | |||
| mathew | "An inexpensive microbalance also changes the costs of running filter-based PM monitors, some of which are Federal Reference Methods for PM2.5/10. C..." | Read more » | about 8 years ago | |||
| mathew | "This is a good idea. There are a series of PM, NOx and SOx monitoring tools built around this idea that require a balance such as this. I found ..." | Read more » | about 8 years ago | |||
| gretchengehrke | "I think this is a super interesting idea. There would be, of course, a lot of caveats and assumptions made, but I'd be interested in exploring them..." | Read more » | about 8 years ago | |||
| Annmarie | "Hi @Johudson1 - I am very interested in this topic as well. Did you get any response regarding lab space or other interested parties to help cond..." | Read more » | over 8 years ago | |||
| danbeavers | "The cotton balls that I have do not have brighteners. I checked with my UV laser. I was wondering if they have the same absorption characteristic..." | Read more » | over 8 years ago | |||
| mcairns | "Hi All, Tampons shouldn't contain brighteners--we tested several different types, from the "all natural and organic" types, to plain old Tampax, to..." | Read more » | over 8 years ago | |||
| danbeavers | "I wonder if just plain cotton balls would work just as well? " | Read more » | over 8 years ago | |||
| gretchengehrke | "What kind of tampons did you use in this experiment? I was just looking up tampon materials, and it looks like different brands use cotton, rayon,..." | Read more » | over 8 years ago | |||
| warren | "This is one of the first things that was done with UV fluorescence with the Public Lab Spectrometer -- showing brighteners in free & clear laun..." | Read more » | over 8 years ago | |||
| gretchengehrke | "This is great. Using absorbent materials to concentrate aquatic contaminants for analysis has a good, long history and the next step -- extracting..." | Read more » | almost 9 years ago | |||
| Wheels | "Hi Joshua. I am working in the Plastic Waste reduction industry, so if you have questions, ask away. Firstly though, there are as many Myths re pro..." | Read more » | almost 9 years ago | |||
| epongrat | "I'm not positive it will work. My arduino kit came with a small photoresistor, pictured here. I asked my advisor, Charlie Schweik to purchase an..." | Read more » | over 9 years ago | |||
| lauradietz | "These are a bunch of great ideas! Can you explain how the sensor will help you decide where to place solar panels? " | Read more » | over 9 years ago | |||
| amysoyka | "My bad! Accident my posted the link to the flcikr PIC of how spectrometry works! :#) All fixed now. Hopefully you can view at the least those scre..." | | almost 10 years ago | |||
| mathew | "Glad to see you organizing! can you put up the facebook link? I don't see it. thanks! " | | almost 10 years ago |