-Determination of Turbidity by Nephelometry (EPA 180.1)


This method is applicable to drinking, surface, and saline waters in the range of turbidity from 0 to 40 nephelometric turbidity units (NTU). Higher values may be obtained with dilution of the sample.

The method is based upon a comparison of the intensity of light scattered by the sample under defined conditions with the intensity of light scattered by a standard reference suspension. The higher the intensity of scattered light, the higher the turbidity. Readings, in NTU’s, are made in a nephelometer designed according to specifications outlined in the method. A standard suspension (i.e., formazin, AMCO-AEPA-1, or Hach Stablcal) is used to calibrate the instrument.


Method Data

Method 180.1
Hold Time48 hours
PreservationAnalysis should begin as soon as possible. Refrigeration or icing to 4oC, to minimize microbiological decomposition of solids, is recommended.
Sample Volume250mL HDPE bottle
Collection MethodGrab sampling
Method RefernceEPA 180.1

Analyte List

AnalyteFormulaCAS Number

* The typical detection limits and analytes are displayed for this particular method. Please contact Specialty Analytical if other analytes or detection limits are required in addition to the 200.8 Analyte List.

Request A Quote

If you would like us to provide a quote for laboratory analysis, just provide us with as much information as you can about your project (the more, the better) and we’ll provide you a quote via email. As you are searching or browsing our Analytical Guide, you’ll see the Request-A-Quote icon… just click on it to start the request process.