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 | ||
|---|---|---|---|---|---|
| sammy_6_2003 | "UPDATE Prices have been adjusted since the original posting of the message in 2018. Please visit www.homeaircheck.com to find the current fees for ..." | Read more » | about 1 year ago | |||
| Ag8n | "Now, to change the topic a little bit. What happens once all this testing gets going? In industry, a financial auditor appears and says " you are..." | Read more » | over 1 year ago | |||
| Ag8n | "There are variations on the method, but check out the USP if using for medical applications. The oldest is a straight " gel clot". The sample is ..." | Read more » | over 1 year ago | |||
| Ag8n | ""Pharmacopeia online" is at " uspbpep.com". " | Read more » | over 1 year ago | |||
| Ag8n | "The Wikipedia article is an interesting read. The initial data said horseshoe crab mortality from L.A.L. testing should be about 3%. However, rec..." | Read more » | over 1 year ago | |||
| Ag8n | "Here's where life gets a bit interesting. There are substances called pyrogens. These cause a fever, sometimes severe, even if the carrier bacteri..." | Read more » | over 1 year ago | |||
| Ag8n | "As a refresher, read USP 31, <1231>"Water for Pharmaceutical Purposes". This is available, for free, from Pharmacopeia online, as mentioned ..." | Read more » | over 1 year ago | |||
| Ag8n | "Error here. It should not be objective c, as noted above. It should be some plastics are showing higher extractables than bulk water. Something..." | Read more » | over 1 year ago | |||
| Ag8n | "Getting a hold of the USP used to be difficult and expensive. While current USP may still be expensive, here is a source for older versions. "Pha..." | Read more » | over 1 year ago | |||
| Ag8n | "USP/BP/EP means United States Pharmacopoeia,BP is British Pharmacopoeia, and EP is European Pharmacopoeia. Sections of the USP are divided into mo..." | Read more » | over 1 year ago | |||
| Ag8n | "The CO2 produced can be measured several ways. Each method has advantages and disadvantages and depends on the final use of the instrument. For exa..." | Read more » | over 1 year ago | |||
| Ag8n | "If you want an overview of TOC, Wikipedia is a good start. The current article seems pretty thorough ( dated 19 July 2022 by 75.143.92.215). Any c..." | Read more » | over 1 year ago | |||
| Ag8n | "Previous methods could be somewhat hazardous. To give an example, ammonia related chemicals often work their way into drug compounds. It can be f..." | Read more » | over 1 year ago | |||
| Ag8n | "Going back over this. We did a lot of work with total organic carbon (TOC). According to Dr. Paul Whitehead at egalabwater.com (the blog title is..." | Read more » | over 1 year ago | |||
| warren | "Thank you for the links and the explanations!!! " | Read more » | about 2 years ago | |||
| Ag8n | "We also used graphite furnace AA, also called GFAA. One common analytical instrument is ICP (inductively coupled plasma). I've used them a couple..." | Read more » | about 2 years ago | |||
| Ag8n | "Another reference. "Some recent developments in atomic fluorescence spectrosopy" by T.S.West Analytical Chemistry, ( presented at 26 th internati..." | Read more » | about 2 years ago | |||
| Ag8n | "Here are a couple of reference: "Studies in atomic fluorescence spectroscopy -III:microwave excited electrodeless discharge tubes as spectral sour..." | Read more » | about 2 years ago | |||
| warren | "Hmm... I guess it seems like a tough setup for my skill set. What does the microwave version look like? " | Read more » | about 2 years ago | |||
| Ag8n | "You know, getting a couple of these that could be "disposable" might not be a bad idea. Working with 400 volts isn't a terribly high voltage, but ..." | Read more » | about 2 years ago | |||
| Ag8n | "That looks like a hollow cathode lamp. We used perkin elmer, not fisher, so there could be differences. The lamp should have the element it can d..." | Read more » | about 2 years ago | |||
| Ag8n | "Aanalyst (a model of atomic absorption spectrometer that we had)hollow cathode lamps new are running for about $350. So when there are hollow cat..." | Read more » | about 2 years ago | |||
| Ag8n | "That looks like a hollow cathode lamp. But there are other kinds. It should have the element on the base plus usually the operating current range..." | Read more » | about 2 years ago | |||
| warren | "https://www.sciencedirect.com/science/article/abs/pii/0039914070800819 " | Read more » | about 2 years ago |