NEMI Method Summary

Method Summary Information

Method Number: 120.1 Media: WATER
Revision: Issued 1971; Editorial Revision 1982
Method Source: U.S. EPA National Exposure Research Laboratory (NERL) [formerly EMSL]
Analytes in this method
Subcategory: INORGANIC
Official Name: Conductance (Specific Conductance, umhos at 25oC)
Descriptive Name Conductance by Conductivity Meter
Source Info: U.S.EPA National Exposure Research Laboratory (NERL)
Microbiological and Chemical Exposure Assessment Research Division (MCEARD)
[formerly the Environmental Monitoring Systems Laboratory (EMSL), Cincinnati, OH]
26 West Martin Luther King Drive
Cincinnati, Ohio 45268-0001
Fax: 513-569-7757
email: DWmethods.help@epa.gov
Citation: Methods for the Chemical Analysis of Water and Wastes (MCAWW) (EPA/600/4-79/020)
15284 Byte file
Brief Method
Summary:
 The specific conductance of a sample is measured by use of a self-contained conductivity meter, Wheatstone bridge-type, or equivalent. Samples are preferable analyzed at 25oC. If not, temperature corrections are made and results reported at 25oC.
Scope And
Application:
 This method determines conductance of drinking, surface, and saline water, domestic and industrial wastes and acid rain (atmospheric deposition).
Applicable
Conc Range:
 Not Available.
Interferences: Turbidity: Since very slight amounts of turbidity interfere with the determination, samples must be filtered before analysis.
QC Requirements: None.
Sample Handling: Analyses can be performed either in the field or laboratory. If analysis is not completed within 24 hours of sample collection, sample should be filtered through a 0.45 micron filter and stored at 4oC. Filter and apparatus must be washed with high quality distilled water and pre-rinsed with sample before use.
Max Holding Time:
 24 hours, unpreserved.
28 days, preserved (MCAWW, Table 1).
Sample Prep Met None.
Relative Cost: Less than $50
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