1.1 本试验方法 2. 包括测定水的气味（即影响嗅觉的特性）。建议的气味分类系统如下所示: 附件A1 . 本试验方法适用于根据气味强度指数或阈值气味数确定气味强度。 1.2 废水可能携带多种化合物，难以单独测量，从而导致臭味问题。化合物的组合可能会导致气味强度或形成无法从单个物质的气味中预期的特征。 1.3 由于人类敏感性的变化，无法高精度地确定气味强度。不同的测试人员并不总是对气味特性达成一致。气味分析提供了测量给定采样点气味强度变化的工具。变化程度可能表明气味问题的程度或重要性。确定变化的原因或不良特性的来源可能比分析单个化合物更好地定义气味问题。 1.4 以SI或英寸表示的值- 磅单位应视为标准。括号中给出的值仅供参考。 1.5 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。 有关具体的危险声明，请参阅下面的警告声明 10.1 . 1.6 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 水的气味是一种主观特性，被认为对其质量有重大影响。本试验旨在提供一种可重复的试验方法，用于测定水中气味的强度，以进行比较或控制。 5.2 该测试可能有助于检查原水或处理水的质量，确定处理程序的有效性，或跟踪工业过程中的污染源或泄漏。 5.3 测试结果在很大程度上取决于观察者，因为个人对气味的敏感性是高度可变的，并且每天都在变化。 仔细规范条件至关重要。

1.1 This test method 2 covers the determination of the odor (that is, the property that affects the sense of smell) of water. A suggested system for classifying odors is given as Annex A1 . The test method is applicable to the determination of odor intensity in terms of odor intensity index or threshold odor number. 1.2 Effluents may carry a myriad of compounds, difficult to measure individually, which contribute to odor problems. Combinations of compounds can cause an odor intensity or develop a characteristic that cannot be anticipated from odors of the individual substances. 1.3 Because of the variation in human sensitivity, high precision in determining odor intensity is not possible. There will not always be agreement on odor characteristics by various testers. Odor analysis provides the tool to measure variation in odor intensity at a given sampling point. The degree of variation may indicate the magnitude or importance of an odor problem. Determining the cause of the variation or the source of the objectionable characteristic may define the odor problem better than analysis for individual compounds. 1.4 The values stated in SI or inch-pound units are to be regarded as the standard. The values given in parentheses are for information only. 1.5 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 the warning statement under 10.1 . 1.6 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 The odor of water is a subjective property which is recognized as having a significant effect on its quality. This test is intended to provide a reproducible test method for determining the intensity of odor in waters for comparative or control purposes. 5.2 The test may be useful in checking the quality of raw or treated waters, determining the effectiveness of treatment procedures, or in tracing sources of contamination or leaks in industrial processes. 5.3 The results of the test are very dependent upon the observers, since the sensitivity of individuals to odor is highly variable and changes from day to day. Careful standardization of the conditions is essential.