ASTM: D1125A: Electrical Conductivity of Non-Flowing Water Samples
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Official Method Name
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Standard Test Methods for Electrical Conductivity and Resistivity of Water |
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Current Revision
| 1995 |
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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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Physical |
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Method Source
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Citation
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Brief Method Summary
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This test method utilizes dip-type or pipet-type conductivity cells for testing static samples having conductivities greater than 10 uS/cm. Temperature control and correction methods are also provided. |
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Scope and Application
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This test method is applicable to field and routine laboratory measurements of the electrical conductivity of water using static samples. |
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Applicable Concentration Range
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10 - 200,000 uS/cm |
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Interferences
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1. Exposure of a sample to the atmosphere may cause changes in conductivity/resistivity, due to loss or gain of dissolved gases. This is extremely important in the case of very pure waters with low concentrations of dissolved ionized materials. 2. Undissolved or slowly precipitating materials in the sample can form a coating on the electrodes of the conductivity cell that may cause erroneous readings. 3. If an unshielded cell is used to measure the resistivity/conductivity of high resistivity water there is a possibility of electrical pickup causing erroneous reading. |
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Quality Control Requirements
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Sample Handling
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Samples shall be collected in accordance with Practice D 1066, Specification D 1192, and Practices D 3370, as applicable. Avoid exposure of the sample to atmospheres containing ammonia or acidic gases. Protect the sample to avoid gain or loss of dissolved gases, particularly if there is some delay before the conductivity measurements are made. |
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Maximum Holding Time
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Relative Cost
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Less than $50 |
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Sample Preparation Methods
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