1.1 这些试验方法包括通过原子吸收分光光度法和微分脉冲阳极溶出伏安法测定水和废水中的溶解镉和总可回收镉。 2. 部分 44 质量控制与这些试验方法有关。包括以下四种试验方法: 浓度 范围 小节 试验方法A-原子吸收， 直接的 0.05至2.0毫克/升 7. 到 15 试验方法B-原子吸收， 螯合萃取 5至200微克/升 16 到 24 试验方法C-差分脉冲 阳极溶出伏安法 1至100微克/升 25 到 34 试验方法D-原子吸收， 石墨炉 2至10微克/升 35 到 43 1.2 试验方法B可用于测定盐水中的镉。用户有责任确保这些测试方法对未经测试的基质水的有效性。 1.3 ICP-MS或ICP-AES也可能适用，但仪器成本较高。见测试方法 D5673 和 D1976 . 1.4 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的数学转换- 磅单位仅供参考，不被视为标准单位。 1.5 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和健康实践，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（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====== 4.1 由于镉是一种有毒物质，而且国家初级饮用水临时法规中规定了饮用水中镉的限量，因此有必要进行镉测试。该测试用于确定饮用水中的镉含量是否高于或低于可接受极限。

1.1 These test methods cover the determination of dissolved and total recoverable cadmium in water and wastewater by atomic-absorption spectrophotometry and differential pulse anodic stripping voltammetry. 2 Section 44 on Quality Control pertains to these test methods. Four test methods are included as follows: Concentration Range Sections Test Method A—Atomic Absorption, Direct 0.05 to 2.0 mg/L 7 to 15 Test Method B—Atomic Absorption, Chelation-Extraction 5 to 200 μg/L 16 to 24 Test Method C—Differential Pulse Anodic Stripping Voltammetry 1 to 100 μg/L 25 to 34 Test Method D—Atomic Absorption, Graphite Furnace 2 to 10 μg/L 35 to 43 1.2 Test Method B can be used to determine cadmium in brines. It is the user's responsibility to ensure the validity of these test methods for waters of untested matrices. 1.3 ICP-MS or ICP-AES may also be appropriate but at a higher instrument cost. See Test Methods D5673 and D1976 . 1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversion 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 and health 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 ====== 4.1 The test for cadmium is necessary because it is a toxicant and because there is a limit specified for cadmium in potable water in the National Interim Primary Drinking Water Regulations. This test serves to determine whether the cadmium content of potable water is above or below the acceptable limit.