苏南某农业区浅层地下水DDTs污染特征分析  

DDTs Pollution of Shallow Groundwater in an Agricultural Area in South Jiangsu

作　　者：李定龙[1] 赵洁[1] 杨彦[1] 杨洁[1] 王宗庆[1] 

机构地区：[1]常州大学环境与安全工程学院,江苏常州213164

出　　处：《生态与农村环境学报》2013年第4期428-432,共5页Journal of Ecology and Rural Environment

基　　金：环保公益性行业科研专项(201109009)

摘　　要：针对苏南某农业区浅层地下水中DDTs的污染特征进行了初步分析,结果表明,浅层地下水中DDTs最大检出质量浓度为1.04μg.L-1,最大检出率为36.67%。浅层地下水DDTs污染呈散状分布,浓度高值点集中在研究区东北部,污染范围大,且表现出丰水期、平水期和枯水期含量依次递减的季节性变化特征。该地区包气带防污性能良好,黏土矿物和有机碳对DDTs吸附作用较强,可阻滞其向浅层地下水环境中迁移,是造成部分地段浅层地下水未检出DDTs污染的重要原因。受污染地表水体的垂向入渗是导致浅层地下水DDTs污染的直接原因,其侧向补给可能是浅层地下水DDTs污染的重要来源之一,且污染范围往往局限于地表水体附近地带。DDTs pollution of shallow groundwater in a certain agricultural area in South Jiangsu was investigated and characterized. It was found that the highest DDTs concentration detected was 1.04 μg · L ^-1 and the highest detection rate 36.67%. The pollution scattered in patches and high concentrations were found mainly in the northeastern part of the study area. The pollution spread in a wide scope and varied seasonally showing a decreasing trend of high water period, normal water period and low water period. In the area, the unsaturated layer was good in anti-pollution performance and clay minerals and organic carbon in the soil were highly capable of adsorbing DDTs, thus retarding transfer of the pollutant into shallow groundwater, which is the reason why in some parts of the area DDTs was not detected in shallow groundwater. Vertical percolation of DDTs polluted surface water was the direct cause of the pollution of the shallow groundwater. Lateral water movement or supply was probably another important DDTs source to shallow groundwater. Therefore, the scope of DDTs pollution in shallow groundwater is limited in the vicinity of surface waterbodies.

关 键 词：浅层地下水 滴滴涕(DDTs) 农业区 苏南地区 

分 类 号：X523[环境科学与工程—环境工程]