1.1 本试验方法涵盖了在0.1至2.0 mg/L范围内的水、废水和盐水中溶解硫氰酸盐的定量比色实验室测量。对于更高浓度，使用稀释样品中的小份。 1.1.1 验证- 该试验方法在0.07至1.42 mg/L的范围内进行了验证。该试验方法在九个实验室的四个水平上进行了验证。该测试方法可能适用于在单个用户实验室中验证的低水平报告结果。 1.1.2 应用程序- 该试验方法已在多个实验室的II型试剂水和7种自然水、1种实验室废水、1种钢厂废水以及单个实验室的2种脱氯和处理过的卫生废水中得到验证。用户有责任确保测试方法在任何未测试矩阵上的有效性。 1.2 以国际单位制表示的数值应视为标准值。 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）。本标准的用户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，请参阅第节 9 . 1.4 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====== 5.1 本试验方法适用于分析许多含有有机分解产物和废水排放中硫氰酸盐的天然水。 一些工业废物，例如来自金矿石冶金加工、钢铁工业、炼油和煤气化的废物，可能含有高浓度的硫氰酸盐。硫氰酸盐本身不被视为有毒化合物。然而，当氯化时，硫氰酸盐在高pH值下转化为剧毒和挥发性的氯化氰。硫氰酸盐的氧化也可能释放有毒的氰化氢。建议该方法的使用者根据实践进行保温时间研究 D4841 当样品中存在氧化剂时。 5.1.1 有关氰和氰化物影响的信息，请参阅测试方法附录X1 D2036 .

1.1 This test method covers the quantitative colorimetric laboratory measurement of dissolved thiocyanate in water, waste water, and saline water in the range from 0.1 to 2.0 mg/L. For higher concentrations, use an aliquot from the diluted sample. 1.1.1 Validation— This test method was validated over the range of 0.07 to 1.42 mg/L. This test method was validated at nine laboratories at four levels. This test method may be valid for reporting results down to lower levels as validated in individual user laboratories. 1.1.2 Application— This test method has been validated in reagent water, Type II, in multiple laboratories and 7 natural waters, 1 laboratory effluent, 1 steel mill effluent, and 2 dechlorinated and treated sanitary effluents in single laboratories. It is the user’s responsibility to assure the validity of the test method on any untested matrices. 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. For specific hazard statements, see Section 9 . 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 This test method is useful for analysis of many natural waters that contain thiocyanate from organic decomposition products and waste water discharges. Some industrial wastes, such as those from the metallurgical processing of gold ores, steel industry, petroleum refining, and coal gasification, may contain significant concentrations of thiocyanate. Thiocyanate per se is not recognized as a toxic chemical compound. However, when chlorinated, thiocyanate is converted to the highly toxic and volatile cyanogen chloride at high pH. Oxidation of thiocyanate may also release toxic hydrogen cyanide. The user of the method is advised to perform holding time studies in accordance with Practice D4841 whenever oxidants are present in the samples. 5.1.1 For information on the impact of cyanogens and cyanide compounds, see Appendix X1 of Test Methods D2036 .