1.1 这些试验方法包括测定用于去除水中钙、镁和钠离子的颗粒阳离子交换材料的工作能力。它用于测试新材料和旧材料。包括以下两种试验方法: 小节 试验方法A-钠循环 8. 到 14 试验方法B-氢循环 15 到 21 1.2 以国际单位制表示的数值应视为标准值。括号中给出的值是英寸-磅单位的数学转换，仅供参考，不被视为标准值。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 9.1 阳离子交换材料经常以钠的形式使用，将进水中的二价和三价离子交换为树脂位置上的钠离子。这个过程通常被称为 软化 因为水可以去除那些与某些肥皂中使用的脂肪酸形成“硬”不溶盐凝块的离子，这些离子在煮沸时也会沉淀。在此过程中，氯化钠用作再生剂，将阳离子交换基团还原为钠形式。 9.2 本试验方法旨在模拟此类材料在实际使用中的性能。它可以用于比较新材料的性能，也可以用于比较已使用材料的性能与其原始性能。 9.3 本文中使用的再生剂浓度和剂量是该应用中使用的材料类型的典型值。 如果使用本试验方法的各方同意不同浓度或数量的再生剂，则应在报告结果时说明这一事实。同样，规定的试验用水是商定的标准。如果在试验中使用其他试验水或待处理的水，则应在试验结果中报告对水的总固体、钠、钙、镁、其他二价或三价金属以及存在的主要阴离子的分析。

1.1 These test methods cover the determination of the operating capacity of particulate cation-exchange materials when used for the removal of calcium, magnesium, and sodium ions from water. It is intended for use in testing both new and used materials. The following two test methods are included: Sections Test Method A—Sodium Cycle 8 to 14 Test Method B—Hydrogen Cycle 15 to 21 1.2 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. 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. ====== Significance And Use ====== 9.1 Cation exchange materials are frequently used in the sodium form to exchange divalent and trivalent ions in the influent water for sodium ions on the resin sites. This process is commonly referred to as softening water since it removes those ions that form a “hard” curd of insoluble salts with the fatty acids used in some soaps and that also precipitate when water is boiled. In such a process, sodium chloride is used as the regenerant to return the cation-exchanging groups to the sodium form. 9.2 This test method is intended to simulate the performance of such materials in actual usage. It may be used either to compare the performance of new materials or to compare the performance of a material that has been used with its original performance. 9.3 Regenerant concentrations and dosages used herein are typical for the types of materials used in this application. If different concentrations or amounts of regenerant are agreed upon by parties using this test method, this fact should be stated when the results are reported. Similarly, the test water specified is the agreed upon standard. Where other test waters or the water to be treated are used in the test, the analysis of the water in terms of total solids, sodium, calcium, magnesium, other di- or trivalent metals as well as the major anions present should be reported with the test results.