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 | ||
|---|---|---|---|---|---|
| jhondue123456 | "https://www.google.com/ " | Read more » | 20 days ago | |||
| MadTinker | "Just a quick update on the status of this project. Willow Creek is going through a couple of serious events. First, the stretch of the stream where..." | Read more » | over 5 years ago | |||
| hpprinter1995 | "Nice And Informative Website. Please Keep Continue Such Kind Of Effort. Contact Us And Get On-Site HP Printer Support & HP Scanner Support. Our..." | Read more » | almost 6 years ago | |||
| pdhixenbaugh | "I'm also looking to measure Conductivity, and I have a Riffle. So you have any advice for what sensor to buy, with the memory constraints and other..." | Read more » | almost 6 years ago | |||
| DrJohnBarrett | "I have more sophisticated instruments for water quality testing, if needed.. " | Read more » | almost 6 years ago | |||
| Paquicamus | "I have done many calibrations to correlate Conductivity vs TDS. One thing that I have found out it will only work for one Creek, river or any surfa..." | Read more » | almost 6 years ago | |||
| stevie | "Also, we split up the kit before the workshop. We had the students divide into groups and rotate through the testing, so everyone was able to get h..." | Read more » | almost 6 years ago | |||
| stevie | "Here's the page we put together to make a worksheet for students. It's from the materials in the book, but since we were doing this with 10 or so s..." | Read more » | almost 6 years ago | |||
| stevie | "I posted a question this morning about how to choose between different methods for monitoring turbidity. Does anyone on this thread have some insig..." | Read more » | about 6 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 » | about 6 years ago | |||
| warren | "Hi, @programmer1200 -- how are you doing? Any updates about your project? Hope you're well! " | Read more » | about 6 years ago | |||
| Vendy | "Thanks to you man! " | Read more » | about 6 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 » | about 6 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 » | about 6 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 » | about 6 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 » | about 6 years ago | |||
| cfastie | "There is also lots of good information in this research note by Don about some testing he did. " | Read more » | about 6 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 » | about 6 years ago | |||
| xose | "So cool! Thanks @programmer1200!! " | Read more » | about 6 years ago | |||
| xose | "@xose awards a barnstar to programmer1200 for their awesome contribution! " | Read more » | about 6 years ago | |||
| donblair | "Hi @gretchengehrke! Sorry for the much-delayed reply :) and thanks for the comment. I, too, liked this approach -- basically, using the differenc..." | Read more » | over 6 years ago | |||
| gretchengehrke | "@donblair, I was just reading this again, and am again impressed by your elegantly simple approach -- such a great idea! It seems like this alterna..." | Read more » | over 6 years ago | |||
| gretchengehrke | "@bhikman, that integrated optical filter is neat, and surprisingly inexpensive! If you do pick this back up, I am super interested in seeing how we..." | Read more » | over 6 years ago | |||
| bhickman | "Hi @gretchengehrke. I kinda let this project fall though the cracks. I did have the sensor working pretty well, the only issue was interference fro..." | Read more » | over 6 years ago |