Measurement of Water Clarity

Turbidity is essentially the clarity of water. Turbidity can be measured in many ways such as a turbidimeter, secci disk or a turbidity tube (which incorporates a secci disk at the bottom). If you had a small turbid water sample - 20mL, how could you measure the turbidity without an electronic device??




Turbidity is measured by the examining the light passing through a sample. A sample's turbidity is formally measured using standardized methods (e.g. ISO 7027 or "Standard Methods," No. 2130B. [source](https://en.wikipedia.org/wiki/Turbidity)). Standardized methods require the instrumentation called for by the standard. 


An informal measure of visible differences in turbidity can be obtained by comparing the 20mL sample to a set of calibrated standards. An example of a set of calibration standards for turbidity are shown in the following link <http://www.water.ncsu.edu/watershedss/info/turbid.html>.


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