【国外标准】 Standard Test Methods and Practices for Evaluating Physical and Chemical Properties of Particulate Ion-Exchange Resins

7.1 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.1.1 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:  SectionsTest Practice A—Pretreatment  6 – 10Test Method B—Water Retention Capacity 11 – 18Test Method C—Backwashed and Settled Density 19 – 26Test Method D—Particle Size Distribution 27 – 35Test Method E—Salt-Splitting Capacity of Cation-Exchange Resins 36 – 45Test Method F—Total Capacity of Cation-Exchange Resins 46 – 55Test Method G—Percent Regeneration of Hydrogen-Form Cation-Exchange Resins 56 – 64Test Method H—Total and Salt-Splitting Capacity of Anion-Exchange Resins 65 – 73Test Practice I—Percent Regeneration of Anion Exchange Resins 74 – 82Test Practice J—Ionic Chloride Content of Anion-Exchange Resins 83 – 90Test Method K—Carbonate Content of Anion-Exchange Resins 91 – 99Test Method L—Sulfate Content of Anion Exchange Resins 100 – 108Test Practice M—Total Anion Capacity of Anion-Exchange Resins  109 – 1171.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard.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, health and environmental practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in Section 10.8.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.