NEMI Method Summary

Method Summary Information

Method Number: D1125A Media: WATER
Revision: 1995
Method Source: ASTM International
Subcategory: PHYSICAL Analytes in this method
Official Name: Standard Test Methods for Electrical Conductivity and Resistivity of Water
Descriptive Name Test Method A: Electrical Conductivity of Non-Flowing Water Samples
Source Info: ASTM International
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Citation: ASTM Volume 11.01
 
Brief Method
Summary:
 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.
Scope And
Application:
 This test method is applicable to field and routine laboratory measurements of the electrical conductivity of water using static samples.
Applicable
Conc Range:
 10 - 200,000 uS/cm
Interferences: 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.
QC Requirements:
Sample Handling: 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.
Max Holding Time:
 
Relative Cost: Less than $50
URL to obtain ordering information for this method:
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