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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??

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  • $\begingroup$ There's a lot of portable turbidity meters with different light sources available. Your choice depends on the the standards that you have to follow: EPA = tungsten filament, ISO = IR leds. $\endgroup$ – Klaus-Dieter Warzecha May 2 '15 at 5:07
  • $\begingroup$ I'm not sure how thats relating to my question? $\endgroup$ – Bob Dylan May 2 '15 at 23:50
  • $\begingroup$ Let me reiterate the question: Measuring the turbidity of a small sample size (20mL) in the cheapest way. $\endgroup$ – Bob Dylan May 3 '15 at 0:00
  • $\begingroup$ First of all, please make your question clear. You changed your question here in the comments. $\endgroup$ – Asker123 May 3 '15 at 2:23
  • $\begingroup$ wow, i think a mod changed it sorry $\endgroup$ – Bob Dylan May 3 '15 at 3:39
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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). 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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