| This work investigated contamination status of the HCHs and DDTs in sediments from surface water, Xinxiang City. Sediments used in this study were collected from 18 sites in surface water of Xinxiang in January 2007. The levels and distribution patterns of the HCHs and DDTs in samples were investigated by the technique of soxhlet extraction followed by the analysis of gas chromatography（GC）coupled with a electron capture detector（ECD）. In addition, the potential sources as well as ecological risks of HCHs and DDTs were analyzed. The concentrations of ∑HCHs（α-, β-, γ-and δ-HCH） and ∑DDTs（p, p′-DDT, o, p′-DDT, p, p′-DDE and p, p′-DDD） in sediments ranged from 1.13 ng·g-1 to 8.12 ng·g-1（average, 2.88 ng·g-1 dw） and 2.38 ng·g-1 to 22.67 ng·g-1 dw（average, 8.07 ng·g-1 dw）, respectively. The compositional analysis of DDTs suggested that historical usage of technical DDTs was the main reason for DDTs residues in the sediments from surface water of Xinxiang, while fresh DDTs inputs from dicofol application were likely to occurred in this region. The ratios of HCHs isomers indicated the present of lindane in the area. Compared with some published guideline values of OCPs in sediments, the concentrations of HCHs were at safe levels while the residues of DDT would pose adverse biological effects in this studied area. |
