浅层地下水卤代烃污染初步研究

笔者通过对某地区浅层地下水中卤代烃（三氯甲烷、四氯化碳、三氯乙烯、四氯乙烯和三溴甲烷）的测试、研究和分析，阐明了该地区浅层地下水中卤代烃污染物主要是三氯甲烷、三氯乙烯和四氯乙烯，主要污染来源是露天堆放的垃圾场、排污河渠和特殊工业企业；确定了污染源分布和包气带岩性是决定该地区卤代烃污染的两个主要因素，冲洪积扇顶部和潜水－承压水过渡带是卤代烃污染的高浓度区；最后对该地区卤代烃污染物的形成和迁移转化机理进行了初步探讨。

Halogenated hydrocarbon contaminants in shallow groundwater

Through an analysis of shallow groundwater in a certain area,t his paper introduces the main halogenated hydrocarbon contaminants(CHCl 3 ,CCl 4 ,CHCl=CCl 2 ,CCl 2 =CCl 2 ,CHBr 3 )in shallow groundwater in the area,and illustrates that the main contamin ants of halogenated hydrocarbons are CHCl 3 ,CHCl=CCl 2 and CCl 2 =CCl 2 and that the main contamination sources of halogenated hydrocarbons in sha llow groundwater are large open waste areas with no defending measures,sewage r ivers and ditches and special industrial enterprises,and confirms that the two main factors for the contamination of halo-genated hydrocarbons are the di stribution of contamination sources and the lithology of the aeration zone and that the high-concentration regions of halogenated hydrocarbons are the top of the alluvial-diluvial fan and the transitional zone between phreatic water and confined water.This paper also preliminarily explores the formation,migra tion and transformation mechanisms of halogenated hydrocarbons in this area.