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| Source identification and ecological risk assessment of polycyclic aromatic hydrocarbons in sediments in the downstream Maozhou River, Shenzhen, China |
| Received:January 18, 2018 |
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| KeyWord:polycyclic aromatic hydrocarbons;source identification;ecological risk assessment;columnar sediment |
| Author Name | Affiliation | E-mail | | LING Jun-hong | School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | ZHANG Yi-zhang | Chinese Research Academy of Environmental Sciences, Beijing 100012, China | zhangyz@craes.org.cn | | ZHOU Bei-hai | School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China | zhoubeihai@sina.com | | KONG De-an | Power China Water Environment Governance, Shenzhen 518100, China | | | WANG Qiang | Yuanling Sub-district Office, Shenzhen 518028, China | | | FAN Chen | Shenzhen Degree of Freedom Sci-Tech Co., Ltd., Shenzhen 518000, China | | | ZHANG Qiu-ying | Chinese Research Academy of Environmental Sciences, Beijing 100012, China | |
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| Abstract: |
| To identify the sources and conduct ecological risk assessment of polycyclic aromatic hydrocarbons (PAHs) in sediment cores from the Maozhou River, nine columnar sediment samples were collected in August 2016. Sixteen kinds of PAHs were identified using gas chromatography-mass spectrometry. The results demonstrated that the range of ∑PAHs in the sediments were 453.7~998.1 ng·g-1, and the average content was 708.3 ng·g-1. The concentration was highly distributed upstream and in the estuary, but low in the middle and downstream. The concentrations of ∑PAHs content of 0~0.5, 0.5~1.0 m, and 1.0~1.5 m were (855.4±81.3), (739.7±70.3) ng·g-1, and (570.3±54.2) ng·g-1, respectively. The number of PAH rings were in the order of 4-ring > 5-ring > 6-ring > 3-ring > 2-ring. Source identification showed that the PAHs in 0~0.5 m of sediments came from the incomplete combustion of grass, wood, and coal; those in 0.5~1.0 m of sediments came from incomplete combustion and mixed sources; and those in 1.0~1.5 m of sediments were mainly from mixed sources, followed by those arising from fossil fuels/petroleum product combustion. BbF, BkF, IcdP, and BghiP, detected at all sample sites, could have toxic effects on living organisms. The concentrations of other components from all sample sites were lower than the ERL value; hence, these were rarely toxic or are non-toxic. The probability of harmful biological effects was less than 10%. |
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