ZHANG Ming1, TANG Fangliang1, ZHANG Wei1, MA Qin2, WANG Jieping2, XU Jianfen1, CHEN Feng2, XU Zhenbo2
（1. Hangzhou Environmental Monitoring Central station, Hangzhou 310007, China;
2. Hangzhou Lin’an District Environmental Monitoring Station, Hangzhou 311300, China）
Abstract: Polycyclic aromatic hydrocarbons (PAHs) were quantitatively determined by HPLC in sediment cores from the Qingshan Reservoir of Hangzhou. The vertical distribution of PAHs was measured and the possible sources of PAHs in sediment were identified. The results showed that 15 out of the 16 priority PAHs identified by US EPA were occurred, pyrene (Pyr) and phenanthrene (Phe) were the dominant PAHs. Total concentrations of PAHs in sediments of the studied reservoir ranged from 324 to 881 ng/g (dry weight ) with an average of 453 ng/g, showing a lower pollution level. The distribution of PAHs was found to be influenced by human activities, the highest PAHs level was detected at Site 2, which is near the tourism boat wharf. Vertically, the content of total PAHs peaked at the intermediate layer of every sediment cores. The PAHs in sediments were mainly high-molecular-weight monomers and dominated by 4 rings PAHs, which accounted for 34.3% to 45.6% of the total PAHs. According to the ratio of feature monomers, the PAHs in sediment of the Qingshan Reservoir originated largely and locally from the incomplete combustion of petroleum. In addition, the potential ecological risk of PAHs in sediments from the Qingshan Reservoir was assessed with methods of sediment quality guidelines and sediment quality standards (SQSs). The result indicated that there was no great biological risk from PAHs in sediment of the Qingshan Reservoir. However, concentrations of some PAHs monomers had exceeded their threshold effect levels defined by SQSs. Therefore, it is necessary to identify contamination sources and to control pollution inputs.
Key words: Qingshan Reservoir; sediment; PAHs; pollution characteristics; ecological risk assessment
EARTH AND ENVIRONMENT Vol.48, No.4, Tot No.336, 2020, Page 405-412