Rivers, oceans, lakes, aquifers, groundwater, stormwater, urban canals, underground streams, estuaries, and more -- we are passionate about water quality! This page will help you find resources to explore the waterbodies you care about, and connect with other people who have the same interests: ### Questions on Water Quality: [questions:water-quality] **** ## Monitoring * [Water sampling](/water-sampling) * [Water sensors](/water-sensors) * Posts on #water-monitoring * Posts on #water-testing * Posts on #reagents ## Water quality parameters Read about different water quality parameters here, including pH, nitrogen, conductivity, temperature, ORP and turbidity: * https://publiclab.org/common-water-contaminants Also see this overview of 7 ways to monitorn water quality: * https://publiclab.org/notes/anngneal/12-08-2017/7-ways-to-measure-monitor-and-evaluate-water-quality ## Groups and projects working on water quality issues: [wikis:project:water-quality] **** ## Water quality related pages [wikis:parent:water-quality] **** ## Activities [activities:water-quality]...
Author | Comment | Last activity | Moderation | ||
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JSummers | "Hi Don, I see no reason why graphite would not work for measuring conductivity. In fact, I think it would work better than most metals since it d..." | Read more » | over 10 years ago | |||
JSummers | "Hi Don, Glad to hear that you liked the explanation. I hope to get around to measuring some metals in water before long and once I do, I will publi..." | Read more » | over 10 years ago | |||
donblair | "Wondering: would graphite of this sort work well as conductivity probes, too? Do the rod comes in standard diameters? Where would you grab them onl..." | Read more » | over 10 years ago | |||
donblair | "Jack, this is fantastic. Very clear explanation! Could we have a follow-up note at some point soon re: e.g. how you might use the WheeStat potent..." | Read more » | over 10 years ago | |||
EdMallon | "Despite my zeal for the project, I have tried not to bomb everyone here with the many incremental updates as I go along. But I think I might have p..." | Read more » | over 10 years ago | |||
JSummers | "Hi Doug, I am still not entirely clear on what it is that you ultimately want to do. I understand that you wish to prepare a PbO2 surface on graph..." | Read more » | over 10 years ago | |||
Nitrous | "Thanks Jack, In its simplest form, I need to set a voltage (2.2v) and keep it there for an extended period of time but in more elegant forms, being..." | Read more » | over 10 years ago | |||
JSummers | "Hi Doug, I am not sure what kind of multi-potential steps you would want to do. Right now we can do a number of voltage profiles, including voltag..." | Read more » | over 10 years ago | |||
Nitrous | "Hi there, Very interesting project. Does this software offer multi-potential steps mode for the GUI? I'm interested in making some lead dioxide on ..." | Read more » | over 10 years ago | |||
eustatic | "definitely include how these photos were taken. Cool! " | Read more » | over 10 years ago | |||
mathew | "I take it the idea is to get the red/blue flashing really fast, making a gradient red-->magenta--->blue depending on the resistance of the th..." | Read more » | over 10 years ago | |||
mathew | "WARNING: do not, under ANY CIRCUMSTANCES get distracted by searching e-bay for vintage Hygrothermographs. " | Read more » | over 10 years ago | |||
donblair | "Also: how hard would it be to rig up some sort of 'pen' that connects to a 555 and writes out a 'record' of the conductivity on some physical mediu..." | Read more » | over 10 years ago | |||
donblair | "ZOMG that's brilliant. I'm going to try to bring the materials required to do a rough prototype of this to Plymouth -- but anyway shouldn't be hard..." | Read more » | over 10 years ago | |||
mathew | "Yes, exactly! I would love to see an analog "retro edition" riffle with a microcassette recorder and a 555, maybe in a really nice Ball jar. " | Read more » | over 10 years ago | |||
warren | "Wow, i'm not sure I follow all of this, but is one potential advantage of the 555 that we could even skip the arduino entirely, if, say, we wanted ..." | Read more » | over 10 years ago | |||
donblair | "E.g. I just found this: http://wiki.openmusiclabs.com/wiki/PWMDAC And, oh gosh, this is fun: http://sensorium.github.io/Mozzi/ And: http://www.ucho..." | Read more » | over 10 years ago | |||
donblair | "Good call on the power control chip -- for the riffle-ito design, I'm just using an LDO, which should provide a relatively clean signal? But yeah,..." | Read more » | over 10 years ago | |||
mathew | "the power issues are going to be tough. Most power control chips do tricky high-speed things to push out a DC signal and the voltage isn't very cle..." | Read more » | over 10 years ago | |||
donblair | "Egads! Mat, thanks for pointing this out! I totally flubbed that one: in the 555 approach, the signal that is passing through the water is indee..." | Read more » | over 10 years ago | |||
mathew | "the 555 is pretty simple. There's not that much inside of it. If it simplifies the power circuitry issues you're facing then go with it. I hadn'..." | Read more » | over 10 years ago | |||
donblair | "Ah -- great thoughts! And your comment points to an important issue, which is that I myself was unclear (and still am, a bit) as to the utility of..." | Read more » | over 10 years ago | |||
mathew | "This is really cool. I would never want to discourage someone from using a 555. And it would be totally sweet to use audio gear to record and ima..." | Read more » | over 10 years ago | |||
zengirl2 | "Bummer, I'm scheduled for an artist's opening on Friday night at my nature center (same weekend as the barnraising). However, I could swear I saw ..." | Read more » | over 10 years ago |