Distribution, source and risk assessment of PAHs in surface sediments from Taihu Lake and its surrounding rivers
KANG Jie1,2, HU Jian3, ZHU Zhao-zhou1, LIU Xiao-long1, WANG Zhong-liang1, BAI Li1, LI Jun1
1. Tianjin Key Laboratory of Water Resources and Environment, Tianjin Normal University, Tianjin 300387, China;
2. Urban and Environmental Science College, Tianjin Normal University, Tianjin 300387, China;
3. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
The concentrations of 16US EPA priority PAHs in surface sediments from Taihu Lake and its surrounding rivers were detected and analyzed. It was found that the total concentrations of PAHs in surface sediments from Taihu Lake ranged from 0.77 to 4.20μg/g, with a mean of 1.63μg/g, and the total concentrations in surrounding rivers ranged from 0.58 to 6.13μg/g, with a mean of 2.92μg/g. A significant difference of PAHs was found in spatial distribution from different lake sediments. The mean concentrations of Meiliang Bay, Gonghu Bay and the East Taihu Lake were 2.48±1.14μg/g, 1.89±0.52μg/g and 2.13±0.50μg/g, respectively, and the mean concentrations of its surrounding rivers Liangxi River, Suzhou River and Changxing Harbor were 7.34μg/g, 6.13μg/g and 5.54μg/g, respectively. Using the ratio method, the isomer ratio method, and Principal Component Analysis and Multiple Linear Regression (PCA-MLR), this study analyzed the pollution sources and contribution rates, suggesting that the main source of PAHs in surface sediments from Taihu Lake and its surrounding rivers was the combustion source. The oil source contribution rate of Taihu Lake was 24%, and the combustion source contribution rate was 76%, while the oil source contribution rate of its surrounding rivers was 41%, and the combustion source contribution rate was 59%. Sediment quality criteria (SQSs) and BaPE(BaP equivalent concentrations) were employed to assess the toxicity of PAHs. It was concluded that Taihu Lake and it surrounding rivers had a certain potential toxicity, especially in its surrounding rivers.
康杰, 胡健, 朱兆洲, 刘小龙, 王中良, 白莉, 李军. 太湖及周边河流表层沉积物中PAHs的分布、来源与风险评价[J]. 中国环境科学, 2017, 37(3): 1162-1170.
KANG Jie, HU Jian, ZHU Zhao-zhou, LIU Xiao-long, WANG Zhong-liang, BAI Li, LI Jun. Distribution, source and risk assessment of PAHs in surface sediments from Taihu Lake and its surrounding rivers. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(3): 1162-1170.
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