Chemical characterization and risk assessment of organochlorine pesticides in sediments and biota from Meiliang Bay of Taihu Lake
To better understand the organochlorine pesticides (OCPs) contamination in Meiliang Bay,Taihu Lake (China),levels of OCPs were measured in the sediment,and the four species of fishes and Bellamya quadrata(Benson) using GC/ECD.The results show that the concentrations of OCPs were found to range from 8.45 to 48.54 ng/g DW (dry weight) in sediments,and from 2.68 to 3 1.34 ng/g WW (wet weight) in biota tissues.Potential human health risk assessment associated with the above organochlorine contaminants due to the consumption of contaminated aquatic products was conducted.The hazard quotients RHQ of DDTs,hexachlorobenzene (HCB),chlordane (CHL) and heptachlor epoxide were all below unity based on non-cancer endpoints,while the cancer hazard ratios RHR of DDTs,HCB,HCHs and heptachlor epoxide were significandy higher than 1 except CHL's.Therefore,the long-term cancer risk caused by DDTs,HCB,HCHs and heptachlor epoxide is of great concern.Based on relative freshwater sediment quality guidelines,the contaminations lead to limited adverse effects on the local aquatic system.
国家科技期刊平台
NSTL
万方数据
维普
