中文摘要：

采用气相色谱／电子捕获检测器法（GC／ECD）对官厅水库表层水体中18种有机氯农药进行分析。结果表明：官厅水库9个采样点水样中18种有机氯农药残留水平为10．06～87．37ng·L^-1，其中∑HCHs和∑DDTs分别为3．93～38．94和3．71～16．03ng·L^-1。官厅水库及其支流水体受到有机氯农药轻度污染，上游工业区废水排放以及各支流周边地区农田排水是官厅水库中有机氯农药的重要来源。与国内外其他地区相比较，官厅水库表层水体中有机氯农药含量较低，∑DDTs、γ-HCH和七氯环氧均未超过GB3838--2002地表水环境质量标准限值。

英文摘要：

Water samples collected from the surface water of the Guanting Reservoir in Beijing of China were tested for 18 kinds of organochlorine pesticides （ OCPs ） , using gas chromatography coupled with an electron capture detector （ GC/ ECD）. Samples from 9 sampling sites were found to have residues of the 18 pesticides in the range of 10.06 -87.37 ng . L^-1, and the concentrations of HCHs and DDTs were in the range of 3.93 - 38.94 ng . L^-1 and 3.71 - 16.03 ng . L^-1, respectively. It has been found that distribution of the organochlorine pesticides is closely related with soil cultivation style and water quality of the inflowing rivers. Wastewater discharged from the industrial zones in the upper streams and drainage from surrounding agricultural fields are major contributors of the pollution. Compared with other areas both at home and abroad, the Guanting Reservoir is lower in OCP concentration and its concentrations of DDTs and BHCs are below the upper limit of the National Standard for Surface Water Environmental Quality in China.