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| Distribution Characteristics and Health Risk Assessment of Surface Water Pollution around Ganzhou Rare Earth Mining Area |
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Received:August 01, 2022
Revised:August 06, 2022
Accepted:August 15, 2022
Published Online:November 14, 2022
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| DOI：doi：10.3969/j.issn.1007-7545.2022.12.018 |
| KeyWord:heavy metals; sulfate; nitrate; spatial distribution; health risk |
| Author | Institution |
| CHEN Ren-Xiang |
江西核工业地质局 |
| ZHANG Bo |
东华理工大学 |
| SONG Yong |
江西核工业地质局有色大队 |
| MA WEN-Jie |
东华理工大学 |
| GAO Bai |
东华理工大学 |
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| Abstract: |
| The surface water around Ganzhou rare earth mining area was taken as research object, and the distribution characteristics of pollutants in water were analyzed. The water quality evaluation and health risk assessment of surface water were carried out through modified Nemerow index method and health risk assessment model. The results show that: 1) The average concentration sequence of pollutants in surrounding water of the rare earth mining area is in the order of sulfate, nitrate, lead, cadmium, and chromium, with the maximum exceeding rate of 52.63% and the maximum exceeding multiple of 12.2 times, which are mainly concentrated in the mining areas of Longnan and Xunwu rare earth mines. The concentration of pollutants drops with the increase of migration distance, and the concentration of pollutants in the upstream area of the river is higher than that in the downstream area. 2) The correlation coefficient between lead and cadmium, sulfate is 0.88 and 0.95, respectively, indicating that these three pollutants have similar pollution sources and similar migration and transformation processes. The correlation coefficient between chromium and lead, cadmium and sulfate is -0.31, -0.21 and -0.29, respectively, indicating that chromium and lead, cadmium and sulfate sources are different or mutual inhibition. The correlation coefficient between nitrate and lead, cadmium and sulfate is 0.073, 0.22 and 0.31, respectively, indicating that nitrate and other pollution factors has multi-source. 3) The health risk intensity sequence of adults is nitrate, lead, sulfate, chromium, and cadmium, and that of children is lead, nitrate, sulfate, chromium and cadmium. The health risk value of adults and children caused by non-carcinogenic pollution factors is 2—5 orders of magnitude higher than that of carcinogenic pollution factors, mainly caused by chromium and cadmium. The total health risk value of children in the study area is higher than that of adults. |
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