1.1 本规程涵盖了含水混合物的制备，其中所含成分的浓度应确保其具有类似于城市废水的物理和化学基质特征。 1.2 根据排入收集系统的材料的数量和性质，废水的变化非常大。用这种方法制备的混合物不代表任何特定废水。相反，它允许用户制备一种混合物，该混合物对试验方法性能的影响与典型的城市废水相似，并且可以用普通材料廉价且可再生地制备。它允许根据同一参考点随时间对测试方法进行评估。 1.3 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。 1.4 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。 1.5 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 替代废水可用于实验室测试，其中需要模拟城市废水的可再生混合物。为了在更苛刻的条件下对测试方法测量分析物的能力和测试方法的精度进行更严格的评估，有必要使用比试剂水更复杂的基质。 替代废水拟用作掺有相关分析物或干扰物的材料，以评估测试方法的性能。 4.2 将替代废水用作实验室间验证研究中的基质将允许在测试方法的精度和偏差部分包含该基质的性能统计数据。测试方法的用户将能够根据公布的结果评估其在该矩阵中测试方法的应用。

1.1 This practice covers the preparation of an aqueous mixture containing constituents in concentrations such that it will have physical and chemical matrix characteristics similar to municipal wastewater. 1.2 Wastewaters are extremely variable, depending on the quantity and nature of the materials being discharged into the collection system. The mixture prepared with this practice is not representative of any particular wastewater. Rather, it allows the user to prepare a mixture that exhibits a similar matrix impact on test method performance as is typical of municipal wastewater and can be prepared from common materials inexpensively and reproducibly. It allows the evaluation of test methods, over time, against the same reference point. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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. 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 Substitute wastewater may be used for laboratory testing where a reproducible mixture simulating municipal wastewater is required. To provide a more rugged evaluation of a test method's ability to measure analytes and the precision of the test method under more demanding conditions, it is necessary to utilize a matrix more complex than reagent water. Substitute wastewater is intended to be used as a material to be spiked with analytes or interferents of interest to evaluate the performance of test methods. 4.2 Utilization of substitute wastewater as a matrix in interlaboratory validation studies will allow inclusion of performance statistics for this matrix in the Precision and Bias section of test methods. Users of test methods will be able to evaluate their application of test methods in this matrix against published results.