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Concentrations, and enantiomeric compositions of HCH, DDT and chlordane in 74 soils of the Pearl River Delta, South China were investigated. The mean concentrations of HCHs and DDTs descended in the order: crop soils>paddy soils>natural soils. The concentrations (ng/g dw) of p,p′-DDE, p,p′-DDT, p,p′-DDD and o,p′-DDT in crop soils were 0.14–231, 0.07–315, <DL-96.7 and 0.06–73.8, respectively,...
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