Significance and Use

The ionic form of an ion-exchange material affects both its equivalent mass and its equilibrium water content. These in turn influence the numerical values obtained in exchange capacity determinations, in density measurements, and in the size of the particles. To provide a uniform basis for comparison, therefore, the sample should be converted to a known ionic form before analysis. This procedure provides for the conversion of cation-exchange materials to the sodium form and anion-exchange materials to the chloride form prior to analysis. These forms are chosen since they permit samples to be weighed and dried without concern for air contamination or decomposition. If other ionic forms are used this fact should be noted in reporting the results.

1. Scope

1.1 These test methods cover the determination of the physical and chemical properties of ion-exchange resins when used for the treatment of water. They are intended for use in testing both new and used materials. The following thirteen test methods are included:

1.2 The values stated in SI units are to be regarded as the standard. The inch-pound units given in parentheses are for information only.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in Section 10.8.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D1129 Terminology Relating to Water

D1193 Specification for Reagent Water

D1293 Test Methods for pH of Water

D2687 Practices for Sampling Particulate Ion-Exchange Materials

D2777 Practice for Determination of Precision and Bias of Applicable Test Methods of Committee D19 on Water

E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves

Keywords

anion resins; cation resins; exchange capacity; ion exchange; Cation exchange capacity; Anion exchange resins; Chloride analysis--water applications; Density; Exchange capacity; Ion exchange materials/applications; Particle analysis--water; Salt-splitting capacity; Water retention;

ICS Code

ICS Number Code 71.100.40 (Surface active agents)

DOI: 10.1520/D2187-94R09E01

ASTM International is a member of CrossRef.

ASTM D2187