Introduction to ASTM D5391
When assessing conductivity, samples with moderate to high ionic strength are usually used since they are less likely to become contaminated during regular laboratory handling. ASTM D5391, on the other hand, takes extra care to minimize trace contamination and accounts for the high and fluctuating temperature coefficients of pure water samples, which can reach up to 7% reading per degree Celsius. MaTestLab is one of the best testing service providers, with the best network of testing laboratories in the USA to carry out ASTM D5391 tests for our clients. Furthermore, the performance of measuring instruments designed for high purity needs to be demonstrated. ASTM D5391 can be used to find traces of ionic pollutants in water.
ASTM D5391 Test Method
| Setting up the apparatus | The apparatus with calibration, lead wire, and flow type conductivity/resistivity cell are set up. |
| Eliminating trace elements | The original purpose of diverting the sample is to prevent impurities from building up inside the cell. If a sample line is used, the flow rate through the cell is set at 200 cc/min or according to the manufacturer’s guidelines. Additionally, several hours of rinse time are allowed if using new sample elements, a flow chamber, or a cell to ensure the full elimination of air and trace contaminants. |
ASTM D5391 Test Specimens
| Specimen Detail | Water samples are used in ASTM D5391. To provide representative sampling, water must flow. |
| Specimen Size | Water samples should be more than 0.1 Mohm-cm (less than 10 µS/cm). |
ASTM D5391 Test Results
ASTM D5391 provides detailed guidelines for determining the electrical conductivity and resistivity of a high-purity water sample that is flowing. Defining exact setup, measurement, and calibration procedures ensures accuracy and consistency in resistivity and conductivity measurements.
ASTM D5391 Related Tests
ASTM D5391 is related to tests, including ASTM D1066 for the steam sampling protocol, ASTM D1125 for testing water conductivity and resistivity, and ASTM D1193 for reagent water specifications.
