Abstract
Seventeen soil samples were collected along the main stream of the Hanjiang River in April 2013. Thirteen types of organochlorine pesticides (OCPs) were detected in the samples by gas chromatography with a 63Ni electron capture detector. The purpose of this study was to investigate the distribution, composition, and source of OCPs and assess the potential health risks for local residents. The 13 types of OCPs were all detected in this region, ranging from 2.97 ng·g-1 to 1275.79 ng·g-1, and the detection rates were 75%-100%. The contribution trends of both hexachlorocyclohexanes (HCHs) and dichlorodiphenyltrichloroethanes (DDTs) were upstream < midstream < downstream. Based on the ratio method, the HCHs were mainly from technical HCH input. Furthermore, there was DDT input recently, which contained industrial DDT and dicofol. The DDTs concentrations significantly correlated with total organic carbon. The values of cancer and non-cancer risks (10-12-10-8 and 10-6-10-3) were both lower than the corresponding thresholds (10-6 and 1), which indicated that the soils in the Hanjiang River Basin had no harmful effects on local residents.
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