1.1 本试验方法包括测定10μS/cm以下（0.1 Mohm cm以上）高纯水样品的电导率和电阻率。它既适用于连续测量，也适用于周期性测量，但在任何情况下，水都必须流动，才能提供有代表性的采样。静止的 抓住 取样不能用于这种高纯度的水。连续测量直接在纯水工艺管线中进行，或在侧线样品管线中进行以实现对高温或高压样品的测量，或同时对两者进行测量。 1.2 以国际单位制表示的数值应视为标准。本标准不包括其他计量单位。 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。 1.4 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 电导率测量通常在中等至高离子强度的样品上进行，其中常规实验室处理中开放样品的污染可以忽略不计。在这些条件下，使用1到3的系数进行标准温度补偿 % 在较宽的浓度范围内，每摄氏度的读数是合适的。相比之下，这种测试方法需要特别考虑以减少微量污染，并适应纯水样品的高温度系数和可变温度系数，其范围可高达7 % 每摄氏度的读数。 此外，必须在高纯度条件下证明测量仪器的设计性能。 5.2 本试验方法适用于检测水中微量离子污染物。它是监测除盐和其他高纯水处理操作性能的主要手段。它还用于检测锅炉水、微电子冲洗水、制药工艺水等中的离子污染，以及监测和控制锅炉和发电厂循环化学处理化学品的水平。本试验方法补充了试验方法的基本测量要求 第125天 , 第2186页 和 第4519天 . 5.3 在极低水平的碱性污染下，例如0–1μg/L NaOH，电导率会受到抑制，实际上可能略低于纯水的理论值。 ( 1和 2. ) 4. 碱性材料抑制高导电性的氢离子浓度，同时用导电性较低的钠离子和氢氧根离子代替。 这种现象并不干扰电导率或电阻率测量本身，但如果不加以识别，可能会给出该范围内推断的水纯度的误导性指示。

1.1 This test method covers the determination of electrical conductivity and resistivity of high purity water samples below 10 μS/cm (above 0.1 Mohm-cm). It is applicable to both continuous and periodic measurements but in all cases, the water must be flowing in order to provide representative sampling. Static grab sampling cannot be used for such high purity water. Continuous measurements are made directly in pure water process lines, or in side stream sample lines to enable measurements on high temperature or high pressure samples, or both. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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 ====== 5.1 Conductivity measurements are typically made on samples of moderate to high ionic strength where contamination of open samples in routine laboratory handling is negligible. Under those conditions, standard temperature compensation using coefficients of 1 to 3 % of reading per degree Celsius over wide concentration ranges is appropriate. In contrast, this test method requires special considerations to reduce trace contamination and accommodates the high and variable temperature coefficients of pure water samples that can range as high as 7 % of reading per degree Celsius. In addition, measuring instrument design performance must be proven under high purity conditions. 5.2 This test method is applicable for detecting trace amounts of ionic contaminants in water. It is the primary means of monitoring the performance of demineralization and other high purity water treatment operations. It is also used to detect ionic contamination in boiler waters, microelectronics rinse waters, pharmaceutical process waters, etc., as well as to monitor and control the level of boiler and power plant cycle chemistry treatment chemicals. This test method supplements the basic measurement requirements for Test Methods D1125 , D2186 , and D4519 . 5.3 At very low levels of alkaline contamination, for example, 0–1 μg/L NaOH, conductivity is suppressed, and can actually be slightly below the theoretical value for pure water. ( 1 and 2 ) 4 Alkaline materials suppress the highly conductive hydrogen ion concentration while replacing it with less conductive sodium and hydroxide ions. This phenomenon is not an interference with conductivity or resistivity measurement itself but could give misleading indications of inferred water purity in this range if it is not recognized.