生态环境学报Issue(1)：135-140,6.
珠江入海口表层沉积物中多氯联苯残留与风险评价
Residual characteristics and ecological risk assessment of polychlorinated bi-phenyls (PCBs) in the surface sediments of the outlets of the Pearl River Delta
摘要
Abstract
Sediments are considered to be one of the main destinations of polychlorinated biphenyls (PCBs) in the aquatic environ-ment. Therefore, in order to assess the pollution level of PCBs in the aquatic environment of the Pearl River Delta and their impact on the ecological environment, we collected and analyzed residual PCBs in surface sediments from the eight outlets of the Pearl Riv-er Delta from August, 2011 to May, 2012. Through survey of PCB residues, analysis of PCB composition and distribution character-istics, and pollution risk assessment, we aimed to provide basic information for assessment of the potential environmental hazards caused by PCBs in this area. The concentration of seven PCB residues was determined using a gas chromatography-electron capture detector. Seven polychlorinated biphenyl congeners (including PCB28, PCB52, PCB101, PCB118, PCB153, PCB138, and PCB180) were detected in the surface sediments, among which, the detection rate and mass concentrations of PCB52 were highest. The detec-tion rate of PCB52 was 100%, followed by PCB138 and PCB153, with detection rates of 75%. The mass concentrations of low chlo-rine PCBs were higher than those of high chlorine PCBs. The tetrachlorobiphenyl content accounted for the largest proportion of the total amount of sediment PCBs. Further, the total concentration of the seven PCBs ranged from 6.58 to 47.46 µg·kg-1, with an aver-age value of 24.82 µg·kg-1. The PCB content also varied significantly with the seasons. The highest value was observed in February and the lowest in August. In addition, the mass concentrations of PCBs in the west four outlets were higher than those in the east four outlets (except for the Humen Outlet). Furthermore, the Hakanson ecological risk index method and Canadian sediment quality guidelines (SQG) were used to conduct a preliminary assessment of the pollution of PCBs. These assessments revealed that surface sediments from the Pearl River Estuary were at a greater risk of PCB contamination compared with sediments from other aquatic areas in China and abroad. This may indicate a certain level of potential ecological risk as well as a negative effect on the ecosystem, thus we should pay greater attention to the environment of the Modaomen, Yamen, and Humen Outlets, where greater amounts of pollution were observed.关键词
珠江入海口/多氯联苯/表层沉积物/风险评价Key words
Pearl River estuary/PCBs/surface sediments/residual/risk assessment分类
资源环境引用本文复制引用
李秀丽,赖子尼,穆三妞,赵李娜,王超,高原..珠江入海口表层沉积物中多氯联苯残留与风险评价[J].生态环境学报,2013,(1):135-140,6.基金项目
广东省海洋渔业科技推广专项(A2011009) （A2011009）
