中文摘要：

采集兰州西固区土壤样品,采用GC/μECD方法检测样品中有机氯农药（OCPs）污染残留,并分析调查区土壤中OCPs污染特征、来源及潜在生态风险。结果表明,8种OCPs异构体在兰州西固区土壤中的检出率均为100%,总质量比范围在18.34μg/kg~125.34μg/kg之间,平均值为54.84μg/kg;土壤中BCHs和DDTs残留质量比分别为0.742μg/kg~29.3μg/kg和10.9μg/kg~98.6μg/kg。OCPs残留以p,p＇-DDT和β-BCH为主。不同采样点土壤样品中OCPs的残留量从高到低依次为路边样〉绿化带样〉树根土样〉菜地样。对DDTs与BCHs异构体残留组分分析发现,调查区土壤中残留的BCHs主要源于历史应用,而DDTs源于近期污染。

英文摘要：

In this study, the organochlorine pest icides （OCPs） residue in soil samples collected in Xigu District of Lanzhou were analyzed by using GC/μECD method. The contamination levels, spatial distribution, isomeric composition, probable sources and potential ecological risks of OCPs in soil samples were systematically investigated. The results showed that 8 kinds of OCPs were detected in all soil samples, and the total concentra-tions of OCPs （∑ 0 CPs） ranged from 18. 34 μg /kg to 125. 34 μg /k g while the average was 54. 84 μ g /k g . The concentration of BCHs and DDTs were in the range of 0. 742 μg /k g to 29. 3 μ g /k g and 10. 9 μg /kg to 98. 6 jxg/kg, respectively. /3 - BCH and p,p＇ - DDT were the dominating compounds. Among the dif ferent sam-pling areas, the concentration of OCPs arranged from high to low was from roadside, greenbelt, tree root and vegetable field. The BCHs residue was derived from previous use, and DDTs was from recent pollution, accord-ing to component analysis of DDTs and BCHs isomer residue.