Spatial and Historical Occurrence, Sources, and Potential Toxicological Risk of Polycyclic Aromatic Hydrocarbons in Sediments of the Largest Chinese Deep Lake

被引:12
作者
Tao, Yuqiang [1 ]
Xue, Bin [1 ]
Feng, Muhua [1 ]
机构
[1] Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm Res, Nanjing 210008, Jiangsu, Peoples R China
关键词
SOURCE APPORTIONMENT; SURFACE SEDIMENTS; YANGTZE-RIVER; LOWER REACHES; PAHS; RATIOS; ATMOSPHERE; DYNAMICS; PLATEAU; CHICAGO;
D O I
10.1007/s00244-019-00650-9
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Lake sediments are important reservoirs for polycyclic aromatic hydrocarbons (PAHs) in catchments. Knowledge of occurrence, sources, and toxicological risk of PAHs is crucial to abate their pollution and risk. We investigated the spatial and temporal occurrence, sources, and potential toxicological risks of 12 PAHs in the surface sediments and one sediment core of the largest deep lake (Lake Fuxian) of China. Our results indicated the average Sigma PAH(12) in the surface sediments of this lake was 1550.6 +/- 231.4 ng gdw-1, much higher than those of most Chinese shallow lakes. The average Sigma PAH(12) in the lake area was higher than that in the estuaries. The average Sigma PAH(12) in the estuaries of influent rivers was higher than that of the outlet river. Coal combustion, gasoline combustion, and diesel combustion were the major sources, which contributed 68.5%, 19.8%, and 11.8% to the Sigma PAH(12). The average total benzo[a]pyrene toxic equivalent concentration (TEQ(carc)) of the six most carcinogenic PAHs was 317.1 +/- 86.3 ngTEQ(carc) g(-1) in the surface sediments. The Sigma PAH(12) increased from 301.7 to 1964.4 ng gdw-1 from 1945 to 2011 and significantly increased with the GDP and population of the catchment. The contribution of coal combustion to the concentrations of PAHs increased gradually with time. The total TEQ(carc), and the percentage of Sigma PAH(carc) to Sigma PAH(12) in the sediment core increased from 5.0 to 84.6 ngTEQ(carc) g(-1) and from 5.7 to 23.3%, respectively. Our study highlights the importance of such deep waters in burying PAHs and the increasing risk of PAHs from human activities.
引用
收藏
页码:501 / 513
页数:13
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