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| Effects of Fe2（SO4）3 combined with solidification agents on the distribution of different antimony forms and ecological risk in antimony-contaminated soil around an antimony mining area |
| Received:November 15, 2021 |
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| KeyWord:antimony contamination;soil;Fe2（SO4）3;lime;cement;distribution of different Sb forms;ecological risk |
| Author Name | Affiliation | E-mail | | BAO Qiongli | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affars, Tianjin 300191, China | | | LIU Zongyang | Tianjin Agricultural University, Tianjin 300384, China | | | WANG Ke | Tianjin Agricultural University, Tianjin 300384, China | | | BAO Wankui | Institute of Agricultural Resource and Regional Planning, CAAS, Beijing 100081, China | baowankui@caas.cn | | HUANG Yizong | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affars, Tianjin 300191, China | |
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| Abstract: |
| In order to understand the effects of Fe2(SO4)3 combined with lime and cement on the content of different forms of antimony (Sb)and its ecological risk in soils with different pollution degrees in a Sb mining area of an antimony mine, the content of different forms of Sb, pH, and ecological risk in soil treated with different remediation agents through a soil culture experiment were taken into account. The results showed that the addition of Fe2(SO4)3 alone reduced the contents of soluble + exchangeable and carbonate-bound Sb by 53%~70% and 31%~70%, respectively; Fe2(SO4)3 + lime treatment only significantly reduced the content of iron-manganese-oxide-bound, organic-bound, or residual Sb in individual sampling sites soils. The treatments of Fe2(SO4)3 compound cement increased the content of soluble + exchangeable and carbonate-bound Sb by 52%~1 264%. Moreover, the addition of Fe2(SO4)3 alone reduced the biological of Sb by 15%~51% and reduced the ecological risk. However, treatments of Fe2(SO4)3 compound cement increased the biological activity of Sb by 56%~828%, and its ecological risk increased to a high or extremely high level. Correlation analysis showed that the change of soil pH significantly affected the available Sb(water-soluble + exchangeable)and potential available Sb(carbonate-bound and iron-manganeseoxide-bound). Overall, Fe2(SO4)3 alone showed good effects on Sb solidification stabilization. Fe2(SO4)3 compound lime weakened the solidification stabilization of Sb by increasing the soil pH compared to the addition of Fe2(SO4)3 alone, while Fe2(SO4)3 compound cement significantly increased the soil pH, available-Sb content, and mobility, bioavailability, and ecological risk of Sb. |
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