Method 160.2

Residue, Non-Filterable (Gravimetric, Dried at 103-105°C)

This method is for the determination of drinking, surface, and saline waters, domestic and industrial wastes.  A well-mixed sample is filtered through a glass fiber filter, and the residue retained on the filter is dried to constant weight at 103-105°C. The filtrate from this method may be used for filterable residue. Non-filterable residue is defined as those solids which are retained by a glass fiber filter and dried to constant weight at 103-105°C.

The practical range of the determination is 4 mg/L to 20,000 mg/L. 

Samples that have dissolved solids (filterable residue) such as saline waters, brines and some wastes may have a positive interference.

Non-representative particulates such as leaves, sticks, fish and lumps of fecal matter should be excluded from the sample if they are required to not be accounted for in the final result.

(EPA: Office of Water)


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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   7 days from sample collection to analysis.
Preservatives:   Store sample at 4°C.
Required Preps:   Glass fiber filter discs without organic binder
Collection Method:   Grab sampling
Analytical Methodology:   Gravimetric
Documentation:   160.2

Analyte List*

Analyte Formula CAS Number Detection Limit
Total Suspended Solids

* 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.