EPA-NERL: 120.1: Conductance by Conductivity Meter
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Official Method Name
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Conductance (Specific Conductance, umhos at 25oC) |
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Current Revision
| Issued 1971; Editorial Revision 1982 |
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Media
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WATER |
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Instrumentation
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Resistor Network |
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Method Subcategory
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Inorganic |
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Method Source
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Citation
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Brief Method Summary
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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. |
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Scope and Application
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This method determines conductance of drinking, surface, and saline water, domestic and industrial wastes and acid rain (atmospheric deposition). |
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Applicable Concentration Range
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Not Available. |
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Interferences
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Turbidity: Since very slight amounts of turbidity interfere with the determination, samples must be filtered before analysis. |
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Quality Control Requirements
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None. |
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Sample Handling
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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. |
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Maximum Holding Time
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24 hours, unpreserved. 28 days, preserved (MCAWW, Table 1). |
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Relative Cost
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Less than $50 |
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Sample Preparation Methods
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None. |
