鄱阳湖龙口地区沉积物中有机氯农药的垂向分布特征

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

摘要: 采用电子捕获检测器气相色谱仪（GC-ECD）测定鄱阳湖龙口地区4个沉积物柱样中有机氯农药含量。结果表明,4个沉积物柱样间有机氯农药含量差异显著，总有机氯农药（∑OCPs）含量为7.78～93.7 ng/g，总六六六（∑HCHs）含量为0.73～39.6 ng/g，总滴滴涕（∑DDTs）的含量为2.44～49.4 ng/g。与国内其他同类样品相比，研究区各化合物的含量水平明显偏高；沉积物中总有机碳（TOC）和OCPs有较好的相关关系；与沉积物风险评估值对比，鄱阳湖龙口地区的有机氯农药存在一定的生态风险。

Abstract: 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.