1.1 本试验方法包括水中浊度的静态测定（见 4.1 )。 1.2 本试验方法适用于5.0浊度单位（NTU）下浊度的测量。 1.3 该试验方法在城市饮用水、超纯水和低浊度样品上进行了试验。用户有责任确保该测试方法对未经测试的基质水的有效性。 1.4 该试验方法使用NTU值中定义的校准标准，但假设其他指定的浊度单位是等效的。 1.5 该测试方法将可追踪的报告单位分配给用于执行测量的相应技术的类型。单位在数值上与校准标准相当。例如，1.0 NTU的甲嗪标准也等于1。 0 FNU标准、1.0 FNRU标准等等。 1.6 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。 关于本试验方法中使用的所有化学品，请参阅MSDS。 1.7 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====== 5.1 饮用水、工厂废水、食品和饮料加工用水以及大量其他水的浊度是不可取的- 依赖的制造过程。去除通常通过混凝、沉淀和过滤来完成。浊度的测量提供了一种快速的过程控制方法，用于何时、如何以及在多大程度上处理水以满足规范要求。 5.2 该测试方法适用于饮用水、工艺水和高纯度工业用水中的浊度。 5.3 在报告测量结果时，还应报告适当的单位。这些单位反映了用于生成结果的技术，如有必要，可以提供与历史数据集更充分的比较。 5.3.1 表1 描述了技术和报告结果（另请参阅参考文献 ( 1- 3. ) )。 6. 所列技术适用于本试验方法中规定的测量范围。其他产品将来可能会上市。 图X5.1 提供了一个流程图，以帮助选择用于低水平静态浊度应用的适当技术。 5.3.2 如果设计不符合中列出的标准 表1 使用时，应以浊度单位（TU）报告浊度，并用下标的波长值来表征所使用的光源。

1.1 This test method covers the static determination of turbidity in water (see 4.1 ). 1.2 This test method is applicable to the measurement of turbidities under 5.0 nephelometric turbidity units (NTU). 1.3 This test method was tested on municipal drinking water, ultra-pure water, and low turbidity samples. It is the users responsibility to ensure the validity of this test method for waters of untested matrices. 1.4 This test method uses calibration standards are defined in NTU values, but other assigned turbidity units are assumed to be equivalent. 1.5 This test method assigns traceable reporting units to the type of respective technology that was used to perform the measurement. Units are numerically equivalent with respect to the calibration standard. For example, a 1.0 NTU formazin standard is also equal to a 1.0 FNU standard, a 1.0 FNRU standard, and so forth. 1.6 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. Refer to the MSDSs for all chemicals used in this test method. 1.7 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 Turbidity is undesirable in drinking water, plant effluent waters, water for food and beverage processing, and for a large number of other water-dependent manufacturing processes. Removal is often accomplished by coagulation, settling, and filtration. Measurement of turbidity provides a rapid means of process control for when, how, and to what extent the water must be treated to meet specifications. 5.2 This test method is suitable to turbidity such as that found in drinking water, process water, and high purity industrial water. 5.3 When reporting the measured result, appropriate units should also be reported. The units are reflective of the technology used to generate the result, and if necessary, provide more adequate comparison to historical data sets. 5.3.1 Table 1 describes technologies and reporting results (see also Refs ( 1- 3 ) ). 6 Those technologies listed are appropriate for the range of measurement prescribed in this test method. Others may come available in the future. Fig. X5.1 provides a flow chart to aid in selection of the appropriate technology for low-level static turbidity applications. 5.3.2 If a design that falls outside of the criteria listed in Table 1 is used, the turbidity should be reported in turbidity units (TU) with a subscripted wavelength value to characterize the light source that was used.