气-质联用法测定水中三氯乙醛的研究

Determination of Chloral Hydrate in Water by Using GC/MS

开发了气-质联用直接测定水中三氯乙醛的技术。利用该技术调查了水厂各工艺段对三氯乙醛前体物的去除,预臭氧接触池,平流池和砂滤池对三氯乙醛前体物去除率分别为8. 69%,25%和32. 6%,后臭氧增加了三氯乙醛生成势,但在后续活性炭环节得到有效去除,并未造成三氯乙醛升高,整套工艺可以有效去除三氯乙醛前体物。三氯乙醛生成势、溶解性有机碳和UV254与三氯乙醛生成势相关性R2分别为0. 64、0. 80和0. 90,UV254可以作为指标来预测三氯乙醛的生成情况。

A method for directly analyzing chloral hydrate(CH)by using GC/MS was developed.The method was used to investigate the removing characteristics of CH precursors of different treatment processes in a drinking water treatment plant.Reduction of precursors of CH by treatment processes of drinking water plants was studied and reduction rates of pre-ozonation,sedimentation tank and sand filter were 36.38%,26.29%and 31.56%,respectively.Post ozonation increased CH formation,but the downstream activated carbon process substantially reduced CH,thus effectively controlled CH precursors.Treatment processes study was efficient in removing precursors of CH.CH precursors were correlated to CFFP,DOC and UV 254 with R 2=0.64,0.80 and 0.90,respectively,and UV 254 could be used to predict CH formation.