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| Assessment of Heavy Metal and Human Health Risk in Surface Soils in a Decommissioned Rare Earth Recycling Plant |
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Received:May 24, 2021
Revised:May 31, 2021
Accepted:May 31, 2021
Published Online:September 18, 2021
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| DOI：doi：10.3969/j.issn.1007-7545.2021.10.018 |
| KeyWord:rare earth recycling plant; soil; heavy metals; pollution assessment; human health risk assessment |
| Author | Institution |
| CHEN Bin |
矿冶科技集团有限公司 |
| ZHU Yi-bin |
矿冶科技集团有限公司 |
| ZHAI Wen-long |
矿冶科技集团有限公司 |
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| Abstract: |
| In order to find out pollution of heavy metals in surface soil in a decommissioned rare earth recycling plant and its risk to human health, 8 soil sampling sites were selected. 24 surface soil samples were collected. Content and distribution of heavy metals were analyzed, single factor index method and soil health risk assessment were used for risk assessment. The results show that the max concentrations of Cu, Zn, Pb, Cd, Cr, As, Hg and Ni in soil samples are 56, 145, 108.20, 3.96, 64, 17.40, 0.21 and 25 mg/kg, respectively, which are higher than the background values of soil environment in study area. Among them, concentrations of Cu, Pb and Cd are all higher than the criteria for screening the risk of agricultural land soil pollution in “Soil Environmental Quality Standard” (GB 15618—2018), which are concentrated near storage tank area, kiln, sewage treatment station. In slag storage yard, Cu slightly exceeds standard. Cd exceeds 12.2 times near storage tank area, which is the maximum value of Cd. Study of single factor index method shows that Zn, Cr, As, Hg and Ni are at the level of non-pollution, Cu and Pb are at the level of non-pollution to light pollution, while Cd is at the level of non-pollution to serious pollution. Assessment of human health risks using three exposure factors of smoking, skin contact and breath contact in soil health risk assessment system shows that Cd, Cr, As cause carcinogenic risk, and Pb, Cr, As cause non-carcinogenic risk, Source analysis results show that Cu, Zn, Cr, As and Pb in soil of study area origins the same or similar sources. It mainly comes from leakage of storage tanks, leakage of sewage treatment station, seepage of leaching water and dust in slag storage yard. |
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