1.1 这些测试方法 2. 涵盖了光度法和原子吸收法测定大多数水和废水中的砷。三种试验方法如下: 浓度 范围 小节 试验方法A-二乙基二硫代银- 氨基甲酸酯比色法 5. μg/L至250 μg/L 7. 到 16 试验方法B-原子吸收， 氢化物生成 1. μg/L至20μg/L 17 到 26 试验方法C——原子吸收， 石墨炉 5. μg/L至100μg/L 27 到 36 1.2 分析员应直接注意每种测试方法的精度和偏差说明。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 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。 1.4 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。 有关具体的危险说明，请参阅 11.1 和 20.2 . 1.5 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====== 4.1 除草剂、杀虫剂和许多工业废水都含有砷，是水污染的潜在来源。 砷是重要的，因为它对人体有不利的生理影响。

1.1 These test methods 2 cover the photometric and atomic absorption determination of arsenic in most waters and wastewaters. Three test methods are given as follows: Concentration Range Sections Test Method A—Silver Diethyldithio- carbamate Colorimetric 5 μg/L to 250 μg/L 7 to 16 Test Method B—Atomic Absorption, Hydride Generation 1 μg/L to 20 μg/L 17 to 26 Test Method C—Atomic Absorption, Graphite Furnace 5 μg/L to 100 μg/L 27 to 36 1.2 The analyst should direct attention to the precision and bias statements for each test method. It is the user's responsibility to ensure the validity of these test methods for waters of untested matrices. 1.3 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. 1.4 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. For specific hazard statements, see 11.1 and 20.2 . 1.5 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 Herbicides, insecticides, and many industrial effluents contain arsenic and are potential sources of water pollution. Arsenic is significant because of its adverse physiological effects on humans.