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Pollution characteristic of polycyclic aromatic hydrocarbons in the groundwater of Hutuo River Pluvial Fan |
CHANG Sheng1,2, GENG Meng-jiao1,2, LIU Yan1,2, WAN Wen-sheng1,2, WANG Shan-jun1,2 |
1. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;
2. State Environmental Protection Key Laboratory of Drinking Water Source Protection, Chinese Research Academy of Environmental Sciences, Beijing 100012, China |
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Abstract In order to investigate the pollution status of polycyclic aromatic hydrocarbons (PAHs) in the groundwater of Hutuo River Pluvial Fan, the 16 US EPA priority control PAHs in the groundwater of this region were analyzed by gas chromatography-mass spectrometry. The occurrence, distribution characteristics, sources and their potential probabilistic carcinogenic risk through drinking water were also assessed in this present study. No PAHs were detected in only two water samples among the 51sample sites. The concentration of the ∑PAHs was ranged from not detectable to 333.4ng/L and with the average value of 58.0ng/L. It was less than that of other reported groundwater regions in China. The average concentration of PAHs for the Gangnan reservoir valley fracture pore water unit (G1), the pore water unit of the top of Hutuo River Pluvial fan (G2) and the pore water unit of the middle part of Hutuo River Pluvial fan (G3) was 215.2ng/L, 9.8ng/L, 9.2ng/L, respectively. The 3~4 ring PAHs was dominant in the total PAHs in G1unit, while the 2~3 ring PAHs was dominant in G2 and G3 units. The source pollution of PAHs in this region was appointed by the molecular ratio and it showed that the coal and biomass burning was predominant source for G1unit, whereas the petroleum products were predominant source for G2 and G3 units. The health risk of drinking groundwater in the study area was evaluated by the recommended method by US EPA and the average cancer risk of G1was over acceptable level (2.1×10-5), which indicated that the quality of groundwater in G1should be pay more attention by government.
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Received: 13 December 2015
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