| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| ch_tavan | " Thank you Lisdahl, I will try to find smaller flow cells that are easier to clean. I use a green LED and a photodiode BPW21 for the detector part..." | Read more » | over 5 years ago | |||
| lizdahl | " That cell is likely just too big for what you are trying to do and therefore hard to flush. I like using z-cells and tiny volumes since it is eas..." | Read more » | over 5 years ago | |||
| ch_tavan | " I use a flow cell that I bought. It is 0.48 ml in volume. I have problems filling the cell and cleaning. I think my cell is not suitable for my fe..." | Read more » | over 5 years ago | |||
| lizdahl | " The main cost for for a FIA or SIA would be a peristaltic pump and a flow cell - I've built my own a couple of times. You could make a flow cell ..." | Read more » | over 5 years ago | |||
| Ag8n | " My mistake, it chemiluminesces in the red, not the blue. Sorry about that. " | Read more » | over 5 years ago | |||
| Ag8n | " I've used ion chromatography(IC) to analyze for a number of ions, including nitrate and nitrite. The new instruments dedicated to IC are much bet..." | Read more » | over 5 years ago | |||
| Ag8n | "Warren got most of the problems with kjeldahl. Here are a few more. Kjeldahl testing takes some specialty glassware. It's not terribly hard to l..." | Read more » | over 5 years ago | |||
| stevie | "Yes! here's the report back on the event https://publiclab.org/notes/Delaney/05-04-2018/water-quality-testing-at-turkey-creek " | Read more » | about 6 years ago | |||
| belkinsa | "Is the report ready? " | Read more » | about 6 years ago | |||
| fez | "That's great...thank you Warren. It's good to see something is moving in this direction too! So far DIY sensing is mostly relegated to air quality ..." | Read more » | almost 7 years ago | |||
| warren | "We're starting to compile a lot of different sensors and testing methods here -- could be of help! https://publiclab.org/wiki/water-sensors " | Read more » | almost 7 years ago | |||
| warren | "We're starting to compile a lot of different sensors and testing methods here -- could be of help! https://publiclab.org/wiki/water-sensors " | Read more » | almost 7 years ago | |||
| cfastie | "I have not worked with water chemistry sensors, but your first impression might be a good one -- a device that can send encoded concentrations of N..." | Read more » | over 7 years ago | |||
| fieldlab | "Yes, a good question @warren - possibly not, and I'm not sure how to find out, apart from buying a whole lot of cheap cell phones. I'll keep thinki..." | Read more » | over 8 years ago | |||
| warren | "Hmm, interesting! Would a cell phone screen be a really consistent spectrum? I wonder how much variability there is in manufacturing. " | Read more » | over 8 years ago | |||
| fieldlab | "Thanks for your reply @warren. There is pretty good discussion going on about this concept on hackaday for Pb detection in drinking water a la Flin..." | Read more » | over 8 years ago | |||
| warren | "Hmm, interesting. I don't know much about paper assays, but this kit available online says: Smallest Increment: Steps: 0, 0.15, 0.3, 1, 1.5, 3 ppm..." | Read more » | over 8 years ago | |||
| jpkearns | "Our systems are simpler, lower in cost, and made from common local materials. Please get in touch if you have questions - www.aqsolutions.org " | Read more » | almost 9 years ago | |||
| emontoya57 | "Very inspiring nice work!!! " | Read more » | almost 9 years ago | |||
| eustatic | "very cool. good question regaring the water pressure control, I've often wondered that myself. " | Read more » | almost 9 years ago | |||
| liz | "FYI Public Lab, additional informal conversation on this is also happening on the WeChat app -- let us know if you want to join there " | Read more » | almost 9 years ago | |||
| chemcarr | "This is very interesting. I am also working towards this kind of analysis, and especially open source accessible, whether fabrication or software/k..." | Read more » | over 9 years ago | |||
| Frikkie | "Just noticed video1's name show nitrate. Its meant to be nitrite, sorry about that. " | Read more » | over 9 years ago | |||
| Phil | "This is wicked Stuff! Thanks for sharing! " | Read more » | over 9 years ago |