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| Effects of silicon- and sulfur-containing materials on the dynamics of cadmium and arsenic species in compound polluted soil |
| Received:September 25, 2019 |
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| KeyWord:cadmium;arsenic;soil;silicon fertilizer;gesso |
| Author Name | Affiliation | E-mail | | PENG Ou | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha 410128, China
Key Laboratory of Southern Farmland Prevention and Control, Ministry of Agriculture and Rural Affairs, Changsha 410128, China | | | ZHOU Jing-heng | Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha 410128, China | | | YU Wei-lun | Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha 410128, China | | | TIE Bai-qing | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha 410128, China
Key Laboratory of Southern Farmland Prevention and Control, Ministry of Agriculture and Rural Affairs, Changsha 410128, China | tiebq@qq.com | | LIU Yu-ling | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha 410128, China
Key Laboratory of Southern Farmland Prevention and Control, Ministry of Agriculture and Rural Affairs, Changsha 410128, China | | | LI Dan-yang | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha 410128, China
Key Laboratory of Southern Farmland Prevention and Control, Ministry of Agriculture and Rural Affairs, Changsha 410128, China | |
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| Abstract: |
| Dynamic changes in cadmium and arsenic species in soils polluted by silicon- and sulfur-containing materials under extremely severe cadmium and arsenic contamination(such as in mines)were investigated. This experiment collected three kinds of soils with different pollution levels(extremely severely polluted soils, severely polluted soils, and mildly polluted soils). The indoor soil cultivation method was used to simulate the application of silicon and sulfur-containing materials to research the effect of the single application(G, S)and mixed application(GS)and mixed application combined with flooding treatment(GSI)on cadmium and arsenic occurrence patterns in light and severe farmland soils. And also the experiment studied the effect of single application(G1, G2, S1, S2), mixed application(GS1, GS2) and different application concentration treatments on the cadmium and arsenic occurrence forms in the polluted soils of extremely severe mining areas.The results showed that the content of weak acid soluble cadmium in the cadmium-arsenic compound contaminated soil in the mining area could be reduced by 6.42%~13.46%, and the residual content was 89.84%~248.57%. The effectiveness of cadmium in the soil was significantly reduced, indicating that the application of high contents of silicon- and sulfur-containing materials(GS2)was effective. The treatment increased the residual arsenic in the soil by 4.74%~13.98%, reducing its availability; treatment with the silicon- and sulfurcontaining materials at low application rate(GS1)was the most obvious. The content of weak acid soluble cadmium in the mildly and heavily polluted soils of arable land decreased in the range of 10.14%~29.93%, and the residual content increased by 21.89%~60.8%. Combined with flooding treatment(GSI), the effect was the best; arsenic in the residual state decreased by 16.51%~23.96%. Under the flooding treatment alone, residual arsenic decreased by 16.51%~23.96%. Silicon- and sulfur-containing materials reduced the bioavailability of cadmium and arsenic in the three types of soils studied. The treatment soils with a mixture of silicon- and sulfur-containing materials was better than treatment with individual materials. The GSI treatment on soil cadmium and arsenic showed the best performance. |
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