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| Distribution characteristics and potential ecological risks of heavy metals in the Gaoxinsha reservoir |
| Received:October 26, 2022 Revised:February 17, 2023 |
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| KeyWord:reservoir;water quality;soil environment;heavy metal;distribution characteristic;ecological risk |
| Author Name | Affiliation | E-mail | | RU Weidong | Guangdong Yuehai Pearl River Delta Water Supply Co., Ltd., Guangzhou 511455, China | | | HUANG Yuxuan | School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China | | | WANG Yuancheng | School of Environment and Energy, South China University of Technology, Guangzhou 510006, China | | | MO Jiancheng | Guangdong Hydropower Planning & Design Institute Co., Ltd., Guangzhou 510635, China | | | TANG Jiayuan | Power China Sinohydro Bureau 7 Co., Ltd., Chengdu 610213, China | | | DANG Zhi | School of Environment and Energy, South China University of Technology, Guangzhou 510006, China | | | HUANG Fei | School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China | feihuang@gdut.edu.cn |
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| Abstract: |
| To investigate the spatial distribution characteristics and potential ecological risks of heavy metals in the Gaoxinsha reservoir soils, the concentrations of heavy metals including Cu, Zn, Cd, Pb, Ni, Cr, Hg, and As were measured at four different soil depths（0-50,50- 100, 100 -200 cm and 200-300 cm）, and their distribution characteristics were visually presented using ArcGIS. The potential environmental risks were further assessed using the standard of soil environmental quality（GB 15618—2018）and Hankanson's potential ecological risk index（RI）, respectively. The results indicated that all reservoir soils were slightly contaminated with Cu, Cd, Pb, Hg, and As. This was the case especially for Cu and As; Cu exceeded the rates by 47.92% and 11.63% for the A layer soil（0-50 cm）and B layer soil（50-100 cm）, respectively, while As generally exceeded standard rate in a range from 4.17% to 35.71%. The ecological risks（Eri）for six heavy metals（Cu, Zn, Pb, Ni, Cr, and As）at different soil depths were below 40, and the RI were well below 150, suggesting that the ecological risk of the reservoir derived from heavy metal was very low. The levels of the seven heavy metals including Cu, Zn, Cd, Pb, Ni, Cr, and Hg in Gaoxinsha reservoir were lower or approaching the values of the existing reservoir in Guangdong Province, while the concentrations of As were slightly higher than those of the existing reservoir. These findings suggest that the soils of Gaoxinsha reservoir are unlikely to be highly polluted by these heavy metals, which means that they are potentially at a“safe”level for the reservoir construction. |
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