The Pollution Characteristics, Bioaccumulation Risks And Preliminary Source Apportionment Of Polychlorinated Biphenyls In Qiantang River

Qiantang river is the largest river in Zhejiang Province, about 85% of drinking water of Hangzhou City is from Qiantang river, it can be said that Qiantang river is the important lifeline to Hangzhou.We were determined to study the pollution characteristics, bioaccumulation risks of PCBs in Qiantang River from the standpoint of water,sediments and aquatic organisms.We also attempted to track the sources of PCBs in Qiantang River by comparison of data of soils,atomsophere and water in order to support the enviromental management of Qiantang River.We found in Qiantang river the PCBs concentration in sediments(2008-2010) ranged from 1.98 to 85.88 ng/g dw with its average concentration of 18.59ng/g dw; In the water body,PCBs concentrations varied from1.12 ng/L to 109.8 ng/L with the average 27.55ng/L. The average concentration of PCBs in aquatic organisms was 20.09ng/g ww.By comparison of the similar studies home and abroad, the sediments and waterbody were in lower pollution levels.By indexes such as BCF, toxic equivalent quantity, hazard quotient(HQ) and the human health risks posed by fishes, the accumlated risks of fish were roughly assessed and there still existed risks.We also used the risk assessment method recommended by U.S.EPA in 2000 to evaluate the risks posed by PCBs-polluted fish food for human health risks and found that weever were safe to eat,but for other species 16 meals per month should not be exceeded.By means of a lot of reseaches done in situ,as well as by comparing PCBs congeners with typical PCBs products,we reached a preliminary conclusion that PCBs in atomsphere and local effluent discharge were the mean reasons of PCBs pollution in Qiantang River.