Vertical Distribution Characteristics of Organochlorine Pesticides inSediments from Longkou of Poyang Lake

The concentration of organochlorine pesticides (OCPs) in 4 sediment samples from Longkou, Poyang Lake was analyzed by GCECD. Concentration of the chemicals was in the range of 7.78～93.7 ng/g for total OCPs, 0.73～39.6 ng/g for HCHs and 2.44～49.4 ng/g for DDTs. Compared with sediments from other areas, OCPs concentrations in sediments were much higher in the studied area. Concentrations of OCPs and total organic carbon （TOC） showed a good correlation in the sediments. By comparing the effects rangemedian （ERL） and effects rangelow （ERM） values for the risk evaluation, OCPs in the surface sediments from Longkou, Poyang Lake has suffered a threat from the ecological risk.