生态环境学报2018，Vol.27Issue(1)：174-181,8.DOI:10.16258/j.cnki.1674-5906.2018.01.024
巯基-蒙脱石复合材料对不同程度Cd污染农田土壤修复研究
Immobilization of Cadmium by Thiol-functionalized Montmorillonite in Soils Contaminated by Cadmium in Various Degrees
摘要
Abstract
In order to clarify the effect of thiol-functionalized montmorillonite on reducing Cd uptake by pakchoi(Brassica chinensis) grown in soils contaminated by cadmium in various degrees , pot and field experiments were conducted with different application amounts of thiol-functionalized montmorillonite. Results showed that: (1) Cd in pakchoi decreased by 27.2%, 62.8%, 73.0% and 88.4% compared to the control in the soil containing 3.25 mg·kg-1Cd with the addition dose of the thiol-functionalized montmorillonite respectively at 0.1%, 0.5%, 1% and 2% of the soil. When the addition dose was 1%, Cd in pakchoi was 0.19 mg…kg-1, which is lower than the limited value of 0.2 mg·kg-1set-up by national food safety standard in china (GB2762—2012). Moreover, when the addition doses were 1% and 2%, the water-soluble Cd in soil reduced by 18.2% and 12.4%, and the exchangeable Cd reduced by 23.8% and 28.6%, respectively. (2) Concerning the thiol-functionalized mixed materials, when the addition doses were 0.5%, 1%, 2%, Cd in pakchoi decreased by 41.4%, 69.1%, 80.6% in 3.25 mg·kg-1Cd contaminated soil, and decreased by 47.5%, 72.1%, 85.2% in 1.43 mg·kg-1Cd contaminated soil, and by 18.3%, 52.5%, 79.4% in 0.62 mg·kg-1Cd contaminated soil. Furthermore, the residue effect of the application on the second crop were still significant. Field experiment showed that the materials reduced cadmium accumulation by the pakchoi. Hence, these materials reduced the activity of Cd in the soil and inhibited the uptake and accumulation of Cd by pakchoi. This study provides a new alternative to the remediation of Cd contaminated soil.关键词
土壤/镉/巯基-蒙脱石复合材料/钝化Key words
soil/cadmium/thiol-functionalized montmorillonite/immobilization引用本文复制引用
朱凰榕,赵秋香,倪卫东,陈亚刚,李媛媛,江海燕..巯基-蒙脱石复合材料对不同程度Cd污染农田土壤修复研究[J].生态环境学报,2018,27(1):174-181,8.基金项目
广东省财政地勘事业发展经费项目(2016206) （2016206）
