在本研究中，氯化饮用水中存在的三卤甲烷（THMs）氯仿和二氯溴甲烷被用作示踪剂化合物，以确定在配水系统泄漏点收集的渗漏样本中是否存在经过处理的城市水。使用碱度、硬度、电导率和pH值等物理和化学测试，泄漏水样的来源通常无法明确确定为经过处理的城市水、地下水或河水。吹扫和捕集气相色谱分析检测到每升毫微克到每升微克的氯仿和二氯溴甲烷含量，可用于确定处理过的城市水的痕量。该方法已成功应用于配电系统主管道和服务管道泄漏样品的分析。 包括16个参考文献、表格和图表。

In this study, the trihalomethanes (THMs) chloroform and dichlorobromomethane, present in chlorinated drinking water, were used as tracer compounds to identify the presence of treated city water in samples of seepage collected at leak sites in the distribution system. Using physical and chemical tests such as alkalinity, hardness, conductivity, and pH, the origin of leakage water samples often could not be identified unequivocally as treated city water, groundwater or river water. Purge-and-trap gas chromatographic analysis detected nanogram-per-liter to low microgram-per-liter levels of chloroform and dichlorobromomethane and can be used to positively identify traces of treated city water. The method was successfully applied to the analysis of distribution system main and service line leak samples. Includes 16 references, tables, figures.