This method is based on 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 under the same conditions. The higher the intensity of scattered light, the higher the turbidity. Formazin polymer is used as the primary standard reference suspension. The turbidity of a specified concentration of formazin suspension is defined as 4000 NTU (nephelometric turbidity units). The method is applicable for surface waters, wastewaters, and drinking water.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | The method specifies as soon as possible after sample collection. Regulatory requirements are usually 48 hours from sample collection to analysis. |
| Preservatives: | Cool sample to 4°C to minimize biological decomposition of solids. |
| Required Preps: | Collect representative samples in clean glassware. |
| Collection Method: | Grab sampling |
| Analytical Methodology: | Nephelometer |
| Documentation: | 
SM 2130B
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Turbidity | 0.02 |
NTU | ||
* The analytes and detection limits listed for each method represent the typical detection limits and analytes reported for that particular method. Keep in mind that analyte lists may vary from laboratory to laboratory. Detection limits may also vary from lab to lab and are dependent upon the sample size, matrix, and any interferences that may be present in the sample.