1.1 这些试验方法包括水和废水中溶解钴和总可回收钴的测定 2. 通过原子吸收分光光度法。包括以下三种测试方法: 浓度范围 小节 试验方法A-原子吸收， 直接的 0.1 mg/L至10 mg/L 7. 到 16 试验方法B-原子吸收， 螯合萃取 10 μg/L至1000 μg/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 试验方法A已成功用于试剂水、饮用水、河水和废水。试验方法B已成功用于试剂水、饮用水、河水、海水和盐水。试验方法C在试剂水、人造海水、河水、自来水和合成盐水中成功评估。 分析员有责任确保这些测试方法对其他矩阵的有效性。 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 11.8.1 , 21.12 和 23.10 . 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 大多数水域的钴含量很少超过天然来源的微量钴。尽管微量钴似乎对一些动物的营养至关重要，但大量钴对植物和动物生活都有明显的毒性影响。

1.1 These test methods cover the determination of dissolved and total recoverable cobalt in water and wastewater 2 by atomic absorption spectrophotometry. Three test methods are included as follows: Concentration Range Sections Test Method A—Atomic Absorption,  Direct 0.1 mg/L to 10 mg/L 7 to 16 Test Method B—Atomic Absorption,  Chelation-Extraction 10 μg/L to 1000 μg/L 17 to 26 Test Method C—Atomic Absorption,  Graphite Furnace 5 μg/L to 100 μg/L 27 to 36 1.2 Test Method A has been used successfully with reagent water, potable water, river water, and wastewater. Test Method B has been used successfully with reagent water, potable water, river water, sea water and brine. Test Method C was successfully evaluated in reagent water, artificial seawater, river water, tap water, and a synthetic brine. It is the analyst's responsibility to ensure the validity of these test methods for other 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 11.8.1 , 21.12 , and 23.10 . 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 Most waters rarely contain more than trace concentrations of cobalt from natural sources. Although trace amounts of cobalt seem to be essential to the nutrition of some animals, large amounts have pronounced toxic effects on both plant and animal life.