本文介绍了常规气味测试中五分之二气味测试的程序和应用 水质监测。在五分之二气味测试中，要求分析员确定 两个不同的水样相同或不同。要进行测试，需要分析员 根据气味特征，将五个样品分为两组和另一组 三个，即使这个决定只是猜测。如果样本被正确分类，这两种水是相同的 被认为在气味特征上明显不同，分析员描述了产生这种气味的原因 差别与使用中的其他气味测试相比，该测试遵循更自然的气味测试过程 使用人类感官评估样本。该试验应用于松川水处理厂 在韩国大田种植，当geosmin 浓度范围为0- 50纳克/升。费城的工作人员使用五取二测试 水务部门决定安装后饮用水的感官质量是否合格，或 更换新水管，并跟进客户对异味的投诉。包括17篇参考文献。

This paper describes the procedure and application of the 2-of-5 Odor Test for use in routine water quality monitoring. In the 2-of-5 Odor Test an analyst is asked to determine if the odors of two different water samples are the same or different. To perform the test, the analyst is required to sort five samples, based on their odor characteristics, into one group of two and another group of three, even if the decision is a guess. If the samples are correctly sorted, the two waters are considered to be noticeably different in odor character and the analyst describes the reason for the difference. In comparison to other odor tests in use, this test follows a more natural process for evaluating samples using human senses. This test was applied at the Songchon Water Treatment Plant in Daejeon, Korea, to monitor an earthy/musty taste-and-odor event when the geosmin concentration varied from 0-50 ng/L. The 2-of-5 test is used by personnel at the Philadelphia Water Department to decide if drinking water is of acceptable sensory quality after installation or replacement of new water mains, and to follow up on customer complaints of off -odors. Includes 17 references.