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| Synchronous passivation and absorption inhibition of Cd-As co-contamination in soil-rice system: A review |
| Received:November 14, 2020 |
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| KeyWord:paddy soil;rice;cadmium and arsenic co-contamination;composite passivation material;physiological barrier |
| Author Name | Affiliation | E-mail | | HUANG Rui | Hunan Institute of Agri-Environment and Ecology, Changsha 410125, China | | | JI Xiong-hui | Hunan Institute of Agri-Environment and Ecology, Changsha 410125, China
Longping Branch of Graduate School of Hunan University, Changsha 410125, China
Hunan Province Key Laboratory of Prevention, Control and Remediation of Soil Heavy Metal Pollution, Changsha 410125, China | 1546861600@qq.com | | WANG Xin | College of Resources and Environmental Science, Hunan Normal University, Changsha 410081, China | | | CHEN Hao-yu | Longping Branch of Graduate School of Hunan University, Changsha 410125, China | | | WEI Wei | Longping Branch of Graduate School of Hunan University, Changsha 410125, China | | | LIU Sai-hua | Hunan Institute of Agri-Environment and Ecology, Changsha 410125, China
Hunan Province Key Laboratory of Prevention, Control and Remediation of Soil Heavy Metal Pollution, Changsha 410125, China | | | XIE Yun-he | Hunan Institute of Agri-Environment and Ecology, Changsha 410125, China
Hunan Province Key Laboratory of Prevention, Control and Remediation of Soil Heavy Metal Pollution, Changsha 410125, China | |
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| Abstract: |
| In recent years, paddy soil co-contaminated with cadmium and arsenic(Cd-As) in China has become increasingly common. Due to the completely opposite chemical properties of Cd and As in soil, Cd-As compound pollution is increasingly considered to be of significance in the remediation of heavy metal contamination in farmland. Compared with other cereal crops, rice has been subjected to growing threats from Cd and As contamination in the soil. Therefore, the remediation of Cd-As co-contaminated paddy soil and the control of the accumulation of Cd and As in rice grains are of great importance to ensure food safety. In situ immobilization technology for soil heavy metal pollution is a widely-applied remediation measure due to its high efficiency. Here, the common compound passivation materials of paddy soil Cd-As pollution, including Fe + alkaline inorganic passivators, Fe + organic passivators, Fe + alkaline inorganic + organic passivators, and organic + alkaline inorganic passivators, along with their remediation mechanisms were summarized. Based on this, the principles of mitigating Cd and As accumulation in rice were also explored. This review suggests that to better inhibit the uptake of Cd and As by rice, passivators should have good ability in soil heavy metal solidification and inhibit heavy metal transport to rice grains through physiological barrier. Considering the broad application prospects of soil-friendly Fe-silicon compound passivators in remediating Cd-As co-contaminated paddy soil, it is critical to develop novel Fe-silicon compound passivators in the future. |
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