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| Effect of titanium gypsum on the availability of arsenic and lead in agricultural soil under paddy-dryland rotation conditions |
| Received:November 09, 2020 |
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| KeyWord:titanium gypsum;arsenic;lead;availability;paddy soil;dryland soil |
| Author Name | Affiliation | E-mail | | ZOU Li-na | Institute of Soil and Water Resources and Environmental Science, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou 310058, China | | | XU Jing-jing | Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, Zhejiang A&F University, Lin' an 311300, China | | | CHEN Zheng-zheng | Institute of Soil and Water Resources and Environmental Science, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou 310058, China | | | YUAN Hong-hong | Institute of Soil and Water Resources and Environmental Science, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou 310058, China | | | YUAN Feng | Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, Zhejiang A&F University, Lin' an 311300, China | | | TANG Xian-jin | Institute of Soil and Water Resources and Environmental Science, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou 310058, China | | | ZHAO Ke-li | Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, Zhejiang A&F University, Lin' an 311300, China | kelizhao@zafu.edu.cn | | YE Zheng-qian | Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, Zhejiang A&F University, Lin' an 311300, China | |
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| Abstract: |
| In this study, a pot experiment simulating a paddy and dry crop rotation was conducted. The effect of different doses(0.15% and 0.30%) of actual titanium gypsum material(ATG) and simulated titanium gypsum material(prepared by mixing calcium sulfate dihydrate and iron oxide according to the mass ratios of 7:3 and 9:1, referred to respectively as TG7 and TG9) on the remediation of arsenic(As) and lead(Pb) co-contaminated soil was studied. The influence of titanium gypsum material on the accumulation of As and Pb in Brassica chinensis L.(dryland) and Oryza sativa L.(paddy) was also investigated. This study will provide the theoretical basis and technical support for the remediation of As-Pb co-contaminated soil. The results showed that the addition of titanium gypsum material reduced the dryland soil pH(5.22) by 0.11~0.49 units and the paddy soil pH(6.35) by 0.27~0.69 units; however, it had little effect on the yield of the two crops. The addition of titanium gypsum material had no significant effect on the available As in dryland soil, but it reduced the As content in the aboveground parts of B. chinensis L. by an average of 39.2%. The addition of titanium gypsum material reduced the available As content(11.96 mg·kg-1) in the paddy soil by an average of 19.9%. At the same time, the As content in brown rice decreased by 28.9% on average. Titanium gypsum material significantly reduced the available Pb in dryland and paddy soil by an average of 12.8% and 17.2%, respectively. It also reduced the Pb content in the aboveground parts of B. chinensis L. by 32.5% and the Pb content in brown rice by 21.9%. The titanium gypsum materials were more effective in paddy soil than in dryland soils, for As and Pb immobilization. Higher addition amounts(0.30%) of titanium gypsum materials were more effective than the lower addition amounts(0.15%). The most effective immobilization amendment for soil co-contaminated with As and Pb was 0.30% TG7. |
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