Geochemical speciation and risk assessment of metals in the river sediments from Dan River Drainage,China |
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| Authors: | Qingpeng Meng Jing Zhang Jicheng Feng Zhaoyu Zhang |
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| Institution: | 1. Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing, China;2. Department of Materials and Environmental Chemistry, Stockholm University, Stockholm, Sweden;3. State Environmental Protection Key Laboratory of Environmental Planning and Policy Simulation, Chinese Academy of Environmental Planning, Beijing, China;4. School of Environmental, Beijing Normal University, Beijing, China;5. Wanbao Mining Limited, Beijing, China |
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| Abstract: | This study investigates the partitioning of metals in surface sediments from the Dan River drainage basin, the source of drinking water for the South to North Water Transfer Project, China, to determine their bioavailability and associated levels of risk. Sediment samples were collected from 99 sites along the Dan River, and the concentration of each element fraction was determined using sequential extraction and inductively coupled plasma-mass spectrometry. The residual fraction was the major phase for most metals sampled. Among the non-residual fractions, greater proportions of Zn, Mn and Cd were transported in in the available phase, whereas Ba, Sb, Pb and As were mainly found in the reducible phase. The oxidisable phase was important for the transport of Ni, Co, Cr and Cu in sediments. This analysis of sediments from the Dan River basin indicates a very high risk of pollution from Cd, Co, Mn, Sb and Zn. Combined with the sediments with extremely high concentrations, the Dan, Laoguan and Yinhua rivers, which have been affected by ore-mining activities, pose a very high risk to the surrounding areas and should be the subject of future studies. |
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| Keywords: | Dan River drainage surface sediment heavy metal BCR sequential extraction risk assessment code (RAC) |
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