Distribution Characteristics of Organochlorine Pesticides in the Soils from the Upper Reaches of Haihe River

Samples of surface soils were collected in the soils from the upper reaches of Haihe River. The residues of 24 organochlorine pesticides(OCPs) in soils were analyzed with gas chromatography for assessing their concentrations,sources and pollution levels. Results showed that 3 types of OCPs were detectable in al1 soil samples. Total concentrations of OCPs( ∑ OCPs) ranged from 2.75 to 139 ng/g,with average of 40.1 ng/g. DDTs and HCHs were the main pollutants in soil samples,whose concentrations were 2.75~131 ng/g and ND~11.0 ng/g respectively. The source analysis suggested that HCHs were mainly from the early usage of commercial HCHs,and some areas might have new input,while DDTs residues in soil might be subject to the industrial use of DDTs and recent usage. HCHs pollution was generally slight in soils while DDTs pollution was quite serious with high environmental risks. The DDTs metabolites such as DDMU,DDM and DBP were also investigated firstly in soil from the upper reaches of Haihe River,and the distribution characteristics of DDT degradation products were also discussed.