Water quality
water-quality

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
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