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| Source apportionment， distribution， and risk assessment of heavy metals in water and sediment near a mining area in the middle reaches of the Yangtze River basin |
| Received:November 13, 2022 Revised:January 16, 2023 |
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| KeyWord:heavy metal;mining area;water-sediment interaction;ecological risk;positive definite matrix factorization |
| Author Name | Affiliation | E-mail | | ZHANG Lihao | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
School of Resources and Environment, Henan Institute of Science and Technology, Engineering Research Center of Biopharmaceutical Fertilize and Collaborative Application in Henan Province, Xinxiang 453003, China | | | WANG Guochang | School of Resources and Environment, Henan Institute of Science and Technology, Engineering Research Center of Biopharmaceutical Fertilize and Collaborative Application in Henan Province, Xinxiang 453003, China | | | YOU Laiyong | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | LIU Mengli | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | TIAN Ruiyun | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | KOU Leyong | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | SUN Bin | National Engineering Laboratory of Contaminated Site Safety Remediation Technology, Beijing Construction Environmental Remediation Co., Ltd., Beijing 100015, China | | | ZHOU Jing | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | zhoujing@issas.ac.cn |
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| Abstract: |
| To explore the characteristic distributions, risks, and sources of heavy metal pollution in the surface water and sediment of a water body near a mining area in the north Jiangxi Province, we measured seven heavy metals(As, Cd, Cr, Cu, Hg, Pb, and Zn)and pH, assessed health risks of these metals in surface water and sediment via single factor index(Pi)and geo-accumulation index, and defined sources of these metals in surface water via positive definite matrix factorization(PMF). Results showed that both surface water and sediment were seriously acidified, with their lowest pH values being 2.12 and 2.62, respectively. The levels of Cu, Zn, and Cd concentrations were very high, exceeding the permissible standard limits for water(0.001-46.96, 0.01-122.90 mg·L-1, and ND-64.97 mg· L-1, respectively)and sediment(21.30-1 840.61, 54.20-1 487.55 mg·kg-1, and 0.04-18.73 mg·kg-1, respectively). The standard exceedance rate of Cd was highest(68.97%)in the study area. Risk assessment results suggested that the pollutant levels of Cd and Cu in more than 50% of the sites were at a severe risk and concentrated in the wastewater source(near the mining area)and lake area. Therefore, Cd and Cu were the key factors that contributed to the potential ecological risk of water and sediment. According to the factor analysis and PMF model, mining activity was the major source of Cd and Cu. Overall, both Cu and Cd in the water and sediment exceed the standard limits and are the main pollutants due to the smelting activity in the study area; therefore, priority should be given to the remediation of Cu and Cd. |
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