Spatial distribution of HCHs and DDTs in agricultural soil of Shanghai suburb

摘要

To study HCHs and DDTs contents and their spatial distribution in the agricultural soil of Shanghai suburb, the residue amounts of HCHs and DDTs in 2413 surface soil samples were determined. The results showed that concentrations of HCHs ranged from 0 to 1.000 mg/kg and DDTs ranged from 0 to 3.000 mg/kg, with occurrence of 88.3% and 98.3%, respectively. The cumulate ratios of soil samples with HCHs less than 0.100 mg/kg and 0.500 mg/kg were 99.2% and 99.9%, respectively. However, the corresponding cumulate ratios for DDTs were respectively 98.3% and 99.8%. The spatial analysis indicated that there was the obvious regional differentiation in soil pollution. Compared with HCHs, soil quality was contaminated more seriously by DDTs in the study area. In addition, areas with high contents of HCHs were mainly located in Minhang, Songjiang and Nanhui, whereas areas with high concentrations of DDTs mainly lied in Jiading Nanhui, Baoshan and Jinshan.