1.1 本规程描述了通过氢离子交换进行的连续样品处理和通过电解电导率进行的测量。在电力行业中，它通常被称为阳离子电导率测量，尽管它实际上是高纯水样品中阴离子污染的指示。测量值通常在小于1的范围内 μS/cm。 1.2 实际电导率测量采用试验方法 D5391 . 1.3 这种做法没有规定单独测定溶解的二氧化碳。参考测试方法 D4519 . 1.4 以国际单位制表示的数值应视为标准。括号中给出的值是对英寸磅单位的数学转换，仅供参考，不被视为标准。 1.5 本标准并不旨在解决与其使用相关的所有安全问题（如有）。 本标准的使用者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。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 阳离子电导率提供了检测锅炉/蒸汽循环中阴离子污染（如氯化物、硫酸盐、硝酸盐、碳酸氢盐和有机酸，如甲酸和乙酸）的最灵敏和可靠的在线手段之一。 5.2 通过有意地从样品中去除pH调节处理化学品，例如氨和胺，并将剩余的盐污染物转化为其导电性约为其三倍的酸形式，可以提供高灵敏度。 5.3 EPRI已经制定了各种循环化学和锅炉类型的阳离子电导率限值指南 ( 2. 4. ) 和ASME ( 5和 6. ) . 5.4 来自阳离子交换柱的样品流出物也可以用于离子色谱或其他阴离子测量，并且在某些情况下是优选的。

1.1 This practice describes continuous sample conditioning by hydrogen ion exchange and measurement by electrolytic conductivity. It is commonly known as cation conductivity measurement in the power industry although it is actually an indication of anion contamination in high purity water samples. Measurements are typically in a range less than 1 μS/cm. 1.2 The actual conductivity measurements are made using Test Method D5391 . 1.3 This practice does not provide for separate determination of dissolved carbon dioxide. Refer to Test Method D4519 . 1.4 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. 1.5 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. 1.6 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 ====== 5.1 Cation conductivity provides one of the most sensitive and dependable on-line means of detecting anionic contamination in the boiler/steam cycle, such as chlorides, sulfates, nitrates, bicarbonates, and organic acids, such as formic and acetic. 5.2 High sensitivity is provided by intentionally eliminating the pH adjusting treatment chemical(s), for example, ammonia and amines, from the sample and converting remaining salt contaminants into their acid forms which are approximately three times as conductive. 5.3 Guidelines on cation conductivity limits for various cycle chemistry and boiler types have been established by EPRI ( 2- 4 ) and by ASME ( 5 and 6 ) . 5.4 The sample effluent from the cation exchange column also may be used, and in some cases is preferred, for ion chromatography or other anion measurements.