• 关键词：污灌区  有机氯农药  TOC  地下水

• 基金项目：国家高技术研究发展计划(863)项目(No.2006AA100205-3);国家自然科学基金项目(No.40702060)

• 金爱芳
• 中国地质大学(北京)水资源与环境工程北京市重点试验室, 北京 100083

• 何江涛
• 中国地质大学(北京)水资源与环境工程北京市重点试验室, 北京 100083

• 陈素暖
• 中国地质大学(北京)水资源与环境工程北京市重点试验室, 北京 100083

• 魏永霞
• 中国地质大学(北京)水资源与环境工程北京市重点试验室, 北京 100083

• 摘要：采用GC-ECD分析了北京东南郊污灌区土壤剖面中有机氯农药(OCPs)的垂向分布特征及其地下水样.结果表明,表土是OCPs的主要累积层位,OCPs总量残留量的最大值为30.93μg·kg^-1,其中的主要污染物为DDTs和HCHs.但与国内外其他地区检出浓度相比,DDTs属于轻度污染,HCHs属于中度污染.表层以下,OCPs含量整体随采样深度加深而明显下降,土壤剖面中的主要污染物为4,4'-DDE、七氯和艾氏剂,但是检出浓度均不高.多元回归分析表明,土壤的TOC含量和含水量是影响OCPs垂向分布的主要因素.地下水样中除DDTs无检出外,其余检出物与土壤剖面中一致,说明在长期污灌条件下,可能会导致浅层地下水的污染.

• Abstract：Soil and groundwater samples were collected from the wastewater irrigation area of Beijing's Southeast suburb,and organochlorine pesticides(OCPs) were analyzed with GC-ECD. The results show that the OCPs mainly accumulate in the topsoil layers with a maximum content of 30.93μg·kg^-1. The main contaminants are DDTs and HCHs. Compared to other reports,DDTs occur at a light pollution level,and HCHs at a moderate pollution level. Under the surface,the OCPs contents drop sharply along the soil profiles. The detected OCPs are 4,4'-DDE,Heptachlor and Aldrin,and their contents are very low. Most of the detected OCPs are near the detection limits. Multiple regression analysis show that the TOC and water content are the major factors which impact the vertical distribution of OCPs in the profiles. The detected OCPs contaminants in groundwater are the same as in the soil profiles except DDTs. Therefore shallow groundwater has the possibility to be contaminated under long-term wastewater irrigation.

• Key words：wastewater irrigation area  organochlorine pesticides(OCPs)  total organic carbon(TOC)  groundwater

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