Method 120.1

Conductance (Specific Conductance, µmho at 25°C)

This method is for the determination of specific conductance in drinking, surface, and saline water, domestic and industrial wastes and acid rain (atmospheric deposition). The specific conductance of a sample is measured by use of a self-contained conductivity meter, Wheatstone bridge-type, or equivalent. Samples should be analyzed at 25°C.  If analyzed at other temperatures, temperature corrections are made and results reported at 25°C.

Slight amounts turbidity interfere with the analysis so samples must be filtered prior toanalysis.

(EPA: Office of Water)


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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   24 hours from sample collection analysis for an un-preserved sample and 28 days for a preserved sample.
Preservatives:   Filter sample through a 0.45 micron filter and store at 4°C if not analyzed within 24 hours of sampling.
Required Preps:   250 mL HDPE or amber glass bottle
Collection Method:   Grab sampling
Analytical Methodology:   Conductivity meter
Documentation:   120.1

Analyte List*

Analyte Formula CAS Number Detection Limit

* 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.