在英国埃塞克斯水务公司Langford工厂进行的一项为期一年的研究中，将氨氯与预氯化阶段的游离余氯进行了比较。研究了这些化学物质在三卤甲烷（THM）形成、水消毒和浮游动物去除中的作用。每周从氯化和絮凝后以及石灰-苏打软化后的点取样。测试和分析包括THM测定、大肠菌群、大肠杆菌和粪便链球菌的细菌学检查，以及原水中主要浮游动物的计数。 在治疗的各个阶段，用氨氯消毒产生的卤代甲烷水平明显低于游离氯。氨氯也提供了令人满意的消毒效果，有效地减少了桡足类。游离余氯对THM的降低效果不如组合氯，但对枝角类更有效。包括2个参考文献、表格和图表。

In a study extending over one year at the Langford works of the Essex Water Company in England, ammonia-chlorine was compared with free residual chlorine in the pre-chlorination stage. The roles of these chemicals in trihalomethane (THM) formation, water disinfection, and zooplankton removal were investigated. Samples were taken weekly from points after chlorination and flocculation and after lime-soda softening. Tests and analyses included THM determinations, bacteriologic examination for coliforms, Escherichia coli, and fecal streptococci, and counts of the predominant zooplankton in the raw water. Disinfection with ammonia-chlorine produced significantly lower levels of haloform than free chlorine at all stages of treatment. Ammonia-chlorine also provided satisfactory disinfection and effectively reduced Copepoda. Free residual chlorine did not reduce THM levels as effectively as combined chlorine, but was more effective against Cladocera. Includes 2 references, tables, figures.