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中文摘要：
选取位于珠江三角洲的佛山市顺德区作为研究对象，分析了26个代表性土壤样品中的17种有机氯农药（OCPs）的含量，并对其来源进行分析。结果显示，17种OCPs在26个土壤样品中均有不同程度的检出，个别有机氯农药的检出率达到100％。六六六异构体中β-HCH的残留量最高，可能与β-HCH的结构有关。另外。可能有新的γ-HCH进入土壤环境。六六六和滴滴涕残留较普遍，但残留量均未达到污染水平。根据分析，土壤中滴滴涕农药主要是过去施用农药的残留，近期没有新的滴滴涕农药进入土壤环境。通过主成分分析可以从除七氯环氧化物、硫丹I、p,p＇-DDD和p,p＇-DDT之外的13种有机氯农药中提取出两个主成分，总方差解释量达到了92．28％。第一主成分主要包括了α-HCH、七氯、艾氏剂、p,p＇-DDE、δ-HCH、硫丹Ⅱ等6种农药，这6种农药之间有着明显的相关性；第二主成分主要包括狄氏剂。
英文摘要：
The contents and sources of 17 organochlorine pesticides （OCPs） were studied in 26 representative soils in Shunde region, Foshan City, the Pearl River Delta. The result showed that 17 types of OCPs were detectable in all soil samples. HCHs and DDTs residues could be detected but were lower than the corresponding limits in the National Soil Environment Quality Standard. Residue content of β-HCH was the highest in HCHs, which was attributed to it＇s structure. There might be new γ-HCH coming into soil recently. It seemed no new source for DDTs. Two principal components were extracted from 13 components by Principal Component Analysis, accounting for 92.28% of the 17 OCPs tested. The first principal component was composed of α-HCH, heptachlor, aldrin, p,p＇-DDE, δ-HCH and endosulfanlI, and the second one was mainly of dieldrin.
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