water-monitoring
water-monitoring


Author Comment Last activity Moderation
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
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
straylight "wow, what a great sounding project Philipp. I like your thinking. Taking an average over 10 or more rows of the camera image is really good. The i..." | Read more » over 11 years ago
eustatic "this is cool. I'm in the Gulf Coast of the United States. We have a large algal bloom that happens every year, as well as a lot of nitrate waste ..." | Read more » over 11 years ago
philippg "hey wattminder, what kind of contaminants can be expected? if they have a specific optical signature, then they can be detected with optical spect..." | Read more » over 11 years ago
wattminder "Hi Philip, This is very interesting and timely. California is now experiencing a huge boom in Hydraulic Fracturing, a practice that employs water a..." | Read more » over 11 years ago