中文摘要：

在江汉平原中部潜江市附近,沿径流选取了9个采样点对地下水进行有机氯农药的（OCPs）气相色谱分析,探讨了地下水中OCPs的分布特征及来源,并对浅层地下水的有机污染及其风险进行了初步评价。结果显示,被测21种OCPs均有不同程度的检出。枯水期和丰水期时,地下水样中HCHs的质量浓度分别为0.03～153.15,0.16～57.25ng/L,DDTs的质量浓度分别为0.05～13.27,0.51～3.18ng/L。HCHs和DDTs的质量浓度变化基本一致,均为枯水期高于丰水期,质量浓度从靠近汉江和长湖两端向中间递减。对HCHs和DDTs的组成进行了分析,结果表明HCHs可能有新的林丹输入,DDTs则主要为历史残留。与国内其他地区对比,本研究区OCPs残留水平较低,各组分未超过饮用水水质标准,对人类的健康风险较小。

英文摘要：

According to groundwater runoff, groundwater samples from nine sampling sites in nearby Qian- jiang in Jianghan plain were analyzed by GC-ECD in order to find out the distribution characteristics of OCPs and make a preliminary evaluation of organic pollution in shallow groundwater. The results showed that almost 21 kinds of OCPs were detectable. The concentrations of HCHs in both dry and wet seasons were in the ranges of 0. 03-153.15 ng/L （with a mean of 17.51 ng/L） and 0. 16-57.25 ng/L （with a mean of 7.08 ng/L） respectively, while the concentrations of DDTs in both dry and wet seasons were in the ranges of 0. 05-13. 27 ng/L （with average of 3.36 ng/L） and 0.51--3.18 ng/L （with average of 1.01 ng/L） respectively. The concentration of HCHs and DDTs were uniformity, their levels in dry season were higher than those in wet season and decreased from both sides to middle. The components of HCHs and DDTs were investigated, which indicated that there were still fresh inputs of lindane to HCHs while DDTs mainly come from historical residue. By comparing OCPs in groundwater with other areas of China, the pollution in the Jianghan plain presented low levels and did not exceed their related water-quality stand- ard for drinking. It makes less risk to human health.