ASTM D7513 The Capacity of Mixed Bed Ion Exchange Cartridges

Scope:

ASTM D7513 is used to determine the initial capacity of unused cartridges, evaluate unused mixed bed ion exchange cartridges for conformance to specifications, and calculate capacity on a cartridge basis. This test method is also important to test different mixed bed resin cartridges.

Procedure:

The ASTM D7513 test strategy is debilitating a cartridge of blended bed particle trade material to a particular endpoint with an influent arrangement of known synthesis and volume. The profluent conductivity of each volumetric augmentation equivalent to 2 Vc is measured and recorded. The process is continued until the 1.0 μS/cm value is achieved; then, at that point, the volume of the test water handled to a 1.0 μS/cm endpoint (V1) in liters is recorded.

Video 01: Working mechanism of a mixed bed ion exchanger

Specimen size:

Cartridge and pressure vessel are required.

Data:

The following data is calculated in ASTM D7513:

Capacity, meq/cartridge = C × V_T

Where C is the concentration of total electrolytes in the test water expressed in mill equivalents per liter and V_T is the volume of test water used, per cartridge, in liters.

Conclusion:

ASTM D7513 is used to determine the initial capacity of unused cartridges, evaluate unused mixed bed ion exchange cartridges for conformance to specifications, and calculate capacity on a cartridge basis.