WANG Bin1,2, DONG Fa-qin1,2, CHEN Shu1,2*, CHEN Meng-jun1,2, ZHU Jing-ping1, TAN Jiang-yue1,
WANG Dao-wei3, ZHAO Shi-min3, PAN Xue-jun3
(1. School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China;
2. Key Laboratory of Solid Waste Treatment and Resource Recycle of Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China;
3. Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China)
Abstract: Sediment is identified as the indicator on residual levels of persistent toxic substances (PTS) in aquatic environments, which can reflect the whole pollution status. Pollution characteristics and risk assessment of the sixteen PAHs controlled priority in surface sediment collected from the National Water Quality Monitoring Stations in Lake Caohai and its estuaries were investigated. The objectives were to track their contamination levels, distribution characteristics, composition transformations, sources and seasonal variability, and to provide more comprehensive fundamental data for risk assessment and contamination control of PAHs in the valley. Residuals of PAHs in Lake Caohai and its estuaries were found ubiquitously. Residual levels of ΣPAHs in wet and dry season were up to 706～11510 and 787～12271 ng/g, respectively. High residuals of PAHs in northern areas of Lake Caohai could pose potential risk to aquatic organisms. Medium molecular weight PAHs were dominant, followed by high and less molecular weight PAHs. Values of TEQs and TEQcarc in the sampling sites were ranked in the order of S1>R1>R3>R2>S3>R4>R5>S2. To some extent, the eight carcinogenic PAHs represented the toxic potential of PAHs. The PAHs in the region came mainly from combustion sources, especially biomass burning. Compared with other regions and countries, residual levels of PAHs in Lake Caohai and its estuaries were amoderate. The dBanA, BaP, BbF and BaA, as the four dominant PAHs, should be listed as the priority controlled contaminations in the valley.
Keywords: Lake Caohai; PAHs; sediment; pollution characteristics; environmental risk
Email: crickswust@163.com
ACTA MINERALOGICA SINICA Vol. 36, No. 1, 2016, Page 19-24
