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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warren | "Hi, Philipp -- I did end up adding a "smooth" macro, which i've demonstrated in this post: http://publiclab.org/notes/warren/10-09-2013/trying-to-d..." | Read more » | over 11 years ago | |||
Suiris | "The test was just to measure the difference in clarity between tap water and filtered water, using a single wavelength instead of a white warm LED ..." | Read more » | over 11 years ago | |||
Ernie | "I afraid that using a laser will not tell you much about the chemical composition of any contamints in your water. The laser spectrum is much too ..." | Read more » | over 11 years ago | |||
Suiris | "Hi drabanus, The time span between each spectra was less than 30 seconds and the LED light had been on for quiet some time before I began the tests..." | Read more » | over 11 years ago | |||
Suiris | "Hi Ernie, Thanks for the great advice and information. To be honest I am completely new to te spectrometer hobby and most of what you wrote baffles..." | Read more » | over 11 years ago | |||
drabanus | "One other test to characterize the stability of your spectrometer is to just repeat identical measurements after a certain time span, say minutes, ..." | Read more » | over 11 years ago | |||
Ernie | "Some typo's in my previous post: To normalize your sample spectrum, you will want (delete "you") to divide... Use an (delete "sample") empty bottle..." | Read more » | over 11 years ago | |||
Ernie | "I hope your system is mechanically stable so as to get reproducible spectra. With regard to the illumination spectrum (the LED), it is not truly w..." | Read more » | over 11 years ago | |||
Suiris | "I am using a Canon IXUS 120 IS for taking pictures, then I cut out the spectrum from the black background, paste it as a new image and upload it t..." | Read more » | over 11 years ago | |||
danbeavers | "OK then I would like to know about your work flow. Are you using a camera attached to your computer or are you taking a picture and then processing..." | Read more » | over 11 years ago | |||
Suiris | "I noticed the shift too danbeavers. My thoughts are that when I cut out the spectrum from my image and pasted it as a new image I wasn´t carefull w..." | Read more » | over 11 years ago | |||
danbeavers | "I wonder about the peaks appearing to shift between different exposures. Looking at the left most peak the filtered 8 second exposure is to the ri..." | Read more » | over 11 years ago | |||
Suiris | "Boiling the samples down to half their volume is a great idea! Will try that next time and see if there are any volatile contaminants. " | Read more » | over 11 years ago | |||
Suiris | "Hi cfastie. Thanks! The water I tested came from the faucet in Stockholm, Sweden. The water treating plants here have a hard time filtrating medici..." | Read more » | over 11 years ago | |||
cfastie | "Excellent test. What do you think is in your water? Particulate matter? Or something dissolved, like a salt? Either way, if you boiled some down to..." | Read more » | over 11 years ago | |||
warren | "I ended up trying some semi-opaque plastic but indeed the light has to be really strong as a result: http://publiclab.org/notes/warren/07-31-2013/m..." | Read more » | over 11 years ago | |||
stoft | "Interesting experiments. Just be careful of the word "enhancement" as it is imprecise within this technical realm. Yes, averaging is useful (assumi..." | Read more » | over 11 years ago | |||
warren | "Actually SW used to smooth at capture time. The other way to do it is not time-smoothing, but averaging in data from the extra dimension in each fr..." | Read more » | over 11 years ago | |||
eustatic | "cool " | Read more » | over 11 years ago | |||
warren | "Very cool! I'd love to help write an API macro which does this on the site... it could tag the spectrum with "smoothed" as well. " | Read more » | over 11 years ago | |||
philippg | "@warren: as sensitivity is my main concern, i'd really avoid masking even more intensity. i'm currently experimenting a bit with possible diffusors..." | Read more » | over 11 years ago | |||
warren | "Instead of a calibrated light source, what about scanning a sample and non-sample simultaneously, so that you can actually measure the input light ..." | Read more » | over 11 years ago | |||
philippg | "@straylight: 'How much water depth (or column depth) is typically analysed when looking for the chlorophyll-A using absorbance ? Is it in the order..." | Read more » | over 11 years ago | |||
webbhm | "I volunteer with LMVP (Lakes of Missouri Volunteer Program), and they conduct water quality monitoring. Their algae sampling is quite formal, wher..." | Read more » | over 11 years ago |