环境工程学报2017，Vol.11Issue(4)：2548-2553,6.DOI:10.12030/j.cjee.201602016
矿物材料对Cd污染土壤中Cd的钝化效果
Effects of mineral materials on passivation effect of Cd in Cd-contaminated soil
摘要
Abstract
A soil culture experiment was carried out to study the effects of five mineral materials (sepiolite,Cabentonite,Na-bentonite,white marble,lime) at three application rates on soil pH,cation exchange capacity (CEC),available Cd,phytoavailability,bioaccessibility,leaching toxicity,and Cd fractions in Cd-contaminated soil.The experimental results indicated that the five mineral materials increased soil pH and CEC significantly.Compared with the control treatment,the pH and CEC increased by 0.46 to 1.15 and 5.8％ to 39.3％,respectively,and values increased proportionally with the increases in the amounts of the mineral materials applied to soil.The diethylenetriaminepentaacetic acid (DTPA) extractions,simple bioaccessibility extraction test (SBET) and the toxicity characteristic leaching procedure (TCLP) were applied to measure plant phytoavailability,bioaccessibility,and leaching toxicity of Cd in Cd-contaminated soil.Application of the five minerals remarkably reduced DTPA-Cd,SBET-Cd,TCLP-Cd in a dose-dependent manner by reduction levels of 9.4％ to 27.5％,6.4％ to 23.8％,and 7.7％ to 20.5％,respectively,compared to the control treatment.The content of acid extractable Cd dramatically decreased and residual Cd increased,while the reducible and oxidizable Cd showed no obvious changes.Compared with the control treatment,the content of acid extractable Cd decreased by 6.2％ to 31.4％ and that of residual Cd increased by 2.8％ to 9.7％ under the mineral material treatments.In all,the five mineral materials had a substantial effect on passivating Cd in Cd-contaminated soil,and the best performances were achieved with the sepiolite and Na-bentonite treatments.关键词
矿物材料/Cd/土壤/钝化Key words
mineral materials/Cd/soil/passivation分类
资源环境引用本文复制引用
谢霏,余海英,李廷轩,张锡洲,郑子成,陈光登..矿物材料对Cd污染土壤中Cd的钝化效果[J].环境工程学报,2017,11(4):2548-2553,6.基金项目
四川省科技支撑计划(2014NZ0008) （2014NZ0008）
四川省教育厅项目(14ZB0017) （14ZB0017）
四川农业大学学科双支计划资助(2015) （2015）
