Assess Turbidity in Water
turbidity

As explained [in @donblair's primer](/notes/donblair/08-25-2015/turbidity-001), measuring turbidity means "measuring the amount of suspended solids in water -- solids that haven't fully dissolved". That is, "turbidity, an optical technique for assessing suspended solids in liquid -- is an important water quality parameter. Typically, light is shone into a liquid sample, and the amount of light scattered back out of the sample (off of particles suspended in it) is measured; the intensity of this scattered light is considered to be related to the amount of suspended solids in the sample." ([reference](/wiki/turbidity_sensing)) _image credit: https://castlebrookestreamstudy.weebly.com/_ This page needs help! * Info about regulations * Info about ecological or human health impacts * Advocacy leverage points * Constraints we're working within: cost, complexity, sensitivity, time There are a LOT of resources available on these pages by @donblair and others: * https://publiclab.org/notes/donblair/08-25-2015/turbidity-001 * https://publiclab.org/wiki/turbidity_sensing **** ## Questions [questions:turbidity] **** ## Sensors Here's a list of different turbidity sensors and measurement systems. See below for some Do-It-Yourself approaches to measuring turbidity, and [this page](https://publiclab.org/wiki/turbidity_sensing) for more information on how turbidity sensors works. * Kelley et al., An Affordable Open Source Turbidimeter http://www.mdpi.com/1424-8220/14/4/7142/pdf * Hackteria.org, Turbiduino: http://hackteria.org/wiki/DIY_turbidity_meters * Lambrou et al., A Nephelometric Turbidity System for Monitoring Residential Drinking Water Quality: http://www2.ucy.ac.cy/~faniseng/publications/SENSAPPEAL09.pdf - Fondriest review: http://www.fondriest.com/environmental-measurements/equipment/measuring-water-quality/turbidity-sensors-meters-and-methods/ - Hach overview: http://www.hach.com/asset-get.download-en.jsa?code=61798 (see [Water sensors](https://publiclab.org/wiki/water-sensors) for more, and [click here to add to this table](https://docs.google.com/spreadsheets/d/1UwjRqU8kHTwEcnDdO2Zxkr8zkFkaGfyePJ-cdnxJzw0/edit#gid=28737041)) **** ## Activities Activities for people to test methods (these develop over time) [activities:turbidity] **** ## Existing work [notes:turbidity] ...


Author Comment Last activity Moderation
stevie "I've noticed there are a couple different methods for monitoring turbidity: Secchi disks: where users putting a disk into a body of water and mea..." | Read more » over 4 years ago
stevie "Here are neat instructions on constructing a turbidity tube by Elizabeth Myre & Ryan Shaw:: http://www.virginia.edu/blandy/blandy_web/education..." | Read more » over 4 years ago
stevie "Oh that decal is nice! I also found a couple really inexpensive secchi disks $18-$25 verses the Lamotte ones which are around $42-70. https://www..." | Read more » over 4 years ago
nshapiro "Very cool! i haven't but seems pretty straightforward just like the technique itself. If you have other uses for black and white rust resistant pai..." | Read more » over 4 years ago
Ag8n "Google " epa method 180.1 determination of turbidity... ". It's dated August of 1993. Should get you started. " | Read more » over 4 years ago
Ag8n "Google epa method 180.1 turbidity by nephlometry. It's dated augu " | Read more » over 4 years ago
stevie "Neat do you know where I could find some methods to do this written out? " | Read more » over 4 years ago
programmer1200 "I'm doing great, school (zoology was harder than I thought lol ) been keeping my busy but I have not forgotten my projects, still working on perfec..." | Read more » over 4 years ago
Ag8n "I've seen a bunch of different things used, but cuvette s are most common. " | Read more » over 4 years ago
warren "Hi, @programmer1200 -- how are you doing? Any updates about your project? Hope you're well! " | Read more » over 4 years ago
warren "Are cuvettes standard for turbidity? We actually stock them in the Kits store, so that'd be convenient. https://publiclab.org/spectrometry-sampling " | Read more » over 4 years ago
Ag8n "If you are looking for 1 cm x 1 cm cuvettes , they should be transparent on all four sides. This way, they can be used for both turbidimeters and ..." | Read more » over 4 years ago
WaterGeek "Great work and super useful for citizen's looking to track the quality and state of open water. We've been looking into something like this for dri..." | Read more » over 4 years ago
Vendy "Thanks to you man! " | Read more » over 4 years ago
gretchengehrke "@programmer1200, This is great! I agree with Chris and Holger that light scattering at a 90-degree angle is the standard approach for turbidity, an..." | Read more » over 4 years ago
programmer1200 "Totally understand where your coming from , its very possible im having some loss because of that, to account for the possible over bright light so..." | Read more » over 4 years ago
Holger "If I got it right, your photometer is measuring amount of light traveling through a solution or suspension. The loss of signal could be due to abso..." | Read more » over 4 years ago
programmer1200 "Thanks That's a lot of good information, now for hands on river work that design works pretty well , I was more working toward collect and then tes..." | Read more » over 4 years ago
cfastie "There is also lots of good information in this research note by Don about some testing he did. " | Read more » over 4 years ago
cfastie "There has been a lot of information about measuring turbidity posted at Public Lab. Don Blair posted an excellent review of the common approaches t..." | Read more » over 4 years ago
warren "Oh, interesting! Maybe @programmer1200 would be interested in this, re: related work on a turbidity sensor... " | Read more » over 4 years ago
Ag8n "The current epa method for turbidity, with standard prep, is at: Https://epa.gov/sites/production/files//2015-08/documents/method_180-1_1993.pdf ..." | Read more » over 4 years ago
xose "So cool! Thanks @programmer1200!! " | Read more » over 4 years ago
xose "@xose awards a barnstar to programmer1200 for their awesome contribution! " | Read more » over 4 years ago