| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| jhondue123456 | "https://www.google.com/ " | Read more » | 20 days ago | |||
| eustatic | "Does this count? It is an operations fugitive emissions point source for Rain CII Carbon in St John Parish, Louisiana. I can't get within a quart..." | Read more » | about 2 years ago | |||
| warren | "Oh, interesting! Maybe @programmer1200 would be interested in this, re: related work on a turbidity sensor... " | Read more » | about 6 years ago | |||
| Ag8n | "The current epa method for turbidity, with standard prep, is at: Https://epa.gov/sites/production/files//2015-08/documents/method_180-1_1993.pdf ..." | Read more » | about 6 years ago | |||
| Ag8n | "Absolutely correct. The fluorescence spectrometer is the same layout as for the basic turbidimeter. The standards are a bit of a pain, but quite ..." | Read more » | over 6 years ago | |||
| warren | "So a design using the Lego Spectrometer, for example, might need a right-angle light source -- but that's not so bad, since already with fluorescen..." | Read more » | over 6 years ago | |||
| warren | "Hm, good point -- actually going back to an old post there's some great stuff here: https://publiclab.org/notes/donblair/08-25-2015/turbidity-001 ..." | Read more » | over 6 years ago | |||
| Ag8n | "By definition, turbidity measures the amount of light scattered at a 90 angle. So there would have to be a change in the optical layout from the ..." | Read more » | over 6 years ago | |||
| warren | "Related: How can we detect contaminants in water samples with a DIY spectrometer using reagents? https://publiclab.org/notes/warren/12-18-2017/ca..." | Read more » | over 6 years ago | |||
| warren | "Also noting that @ygzstc cited some work supporting the use of the area under the curve in a spectrum data reading instead of intensity at one wave..." | Read more » | over 6 years ago | |||
| warren | "Just to clarify here, I believe to sum up we can say that: IF a reagent reacts linearly (for example, if doubling the concentration of the thing t..." | Read more » | over 6 years ago | |||
| warren | "Copying in answer from @stoft, here: It is my understanding that Beer's law is not the relationship between reagent's effect on color, but is the ..." | Read more » | over 6 years ago | |||
| stevie | "@stevie awards a barnstar to gretchengehrke for their awesome contribution! " | Read more » | about 7 years ago | |||
| mathew | "Looks great! i noticed two formatting issues. There seems to be a missing research note in the section: If you are unsure of whether or not this ..." | Read more » | about 7 years ago | |||
| DavidMack | "one other tool you may want to consider is something like a haze cam, see http://hazecam.net/ These are typically used for wide open areas but I t..." | Read more » | over 7 years ago | |||
| gretchengehrke | "Hi Patrick, I am also curious about when the fee is waived and when it's not. I know that in some counties (though I'm not sure if the county is al..." | Read more » | over 7 years ago | |||
| pdhixenbaugh | "Hello Gretchen, I am curious about when the fee is waived and when it is not, as $400 a year is definitely prohibitive for citizen science on a lar..." | Read more » | over 7 years ago |