The increase in toxic heavy metal pollutants in rice paddies threatens food safety. There is an urgent need for lnow-cost remediation technology for immobilizing these trace metals. In this study, we showed that the application of the soil microbial fuel cell (sMFC) can greatly reduce the accumulation of Cd, Cu, Cr, and Ni in the rice plant tissue. In the sMFC treatment, the accumulation of Cd, Cu, Cr, and Ni in rice grains was 35.1%, 32.8%, 56.9% and 21.3% lower than the control, respectively. The reduction of these elements in the rice grain was due to their limited mobility in the soil porewater of soils employing the sMFC. The restriction in Cd, Cu, Cr, and Ni bioavailability was ascribed to the sMFC ability to immobilize trace metals through both biotic and abiotic means. The results suggest that the sMFC may be used as a promising technique to limit toxic trace metal bioavailability and translocation in the rice plants.

稻田中有毒重金属污染物的增加威胁到食品安全。迫切需要用于固定这些痕量金属的低成本的补救技术。在这项研究中，我们表明，土壤微生物燃料电池（sMFC）的应用可以大大减少水稻组织中Cd，Cu，Cr和Ni的积累。在sMFC处理中，水稻籽粒中Cd，Cu，Cr和Ni的积累分别比对照低35.1％，32.8％，56.9％和21.3％。稻谷中这些元素的减少是由于它们在使用sMFC的土壤的土壤孔隙水中的活动性有限。Cd，Cu，Cr和Ni生物利用度的限制归因于sMFC通过生物和非生物手段固定痕量金属的能力。