State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China.
Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection, Nanjing, 210042, China.
Bull Environ Contam Toxicol. 2020 Oct;105(4):639-644. doi: 10.1007/s00128-020-02995-7. Epub 2020 Sep 21.
Arsenic (As) and cadmium (Cd) are common soil pollutants whose opposing geochemical behaviors must be taken into account in the development of cost-effective, environmentally friendly remediation strategies. In this study, a pot experiment with lettuce and a field experiment with wheat were performed to examine the impacts of zeolite, biochar, MnO, zero-valent iron (ZVI) individually and in binary combinations thereof on As-Cd pollution. The results of the pot experiment showed that biochar, MnO and ZVI had good passivation effects on As and Cd when provided individually, but the effects of a combination of 0.2% ZVI/0.5% biochar or 0.2% MnO/0.5% ZVI were even better. These amendments were further investigated in a field experiment, which confirmed the positive effect of 0.2% MnO/0.5% ZVI. Therefore, ZVI/biochar and MnO/ZVI mixtures may offer effective solutions to the remediation of farmland soil contaminated with both As and Cd.
砷（As）和镉（Cd）是常见的土壤污染物，在开发具有成本效益、环境友好的修复策略时，必须考虑它们相反的地球化学行为。本研究通过生菜盆栽实验和小麦田间实验，考察了沸石、生物炭、MnO 和零价铁（ZVI）单独及二元组合对 As-Cd 污染的影响。盆栽实验结果表明，生物炭、MnO 和 ZVI 单独使用时对 As 和 Cd 具有良好的钝化效果，但 0.2% ZVI/0.5% 生物炭或 0.2% MnO/0.5% ZVI 的组合效果更好。这些改良剂在田间实验中进一步得到了验证，证实了 0.2% MnO/0.5% ZVI 的积极作用。因此，ZVI/生物炭和 MnO/ZVI 混合物可能为修复同时受到 As 和 Cd 污染的农田土壤提供有效解决方案。
