农业环境科学学报2016，Vol.35Issue(5)：907-912,6.DOI:10.11654/jaes.2016.05.013
改性赤泥沸石修复材料对土壤中镉的稳定化研究
Stabilization of cadmium in soil using modified red mud-zeolite composite material
摘要
Abstract
A composite material of modified red mud and zeolite was used to stabilize cadmium in soil. Different fractions of soil Cd were ex-tracted by sequential extraction. Available silicon and pH values in soil were also measured to analyze their effects on Cd stabilization. Re-sults showed that zeolite had a great influence on soil pH, with the largest pH value of 8.36 observed at 5%zeolite. But modified red mud had little effect on soil pH even combined with zeolite, with pH ranging from 6.92 to 7.21. Adding modified red mud and zeolite composite material obviously increased available silicon in soil. As high as 359.1%increase was found at 10%application rate of the composite mate-rials(red mud:zeolite=3∶1). At 5%composite material, the greatest stabilization of soil Cd occurred, and exchangeable and carbonate Cd decreased by 79.31%and 45.17%, respectively, while residual Cd fraction increased by 170.84%. The increases in residual Cd were signif-icantly correlated with the decreases in iron manganese oxides-bound Cd(R=-0.975 1). The present results suggest that the ratios of modi-fied red mud and zeolite should be no more than 3∶1, and that applying this composite material not only increases soil available silicon but also promotes the transformation of exchangeable-, carbonates-, and iron manganese oxides- Cd to residual Cd.关键词
改性赤泥/沸石/镉/有效硅/稳定化Key words
modified red mud/zeolite/cadmium/available silicon/stabilization分类
资源环境引用本文复制引用
朱晴,罗惠莉,吴根义,周颖..改性赤泥沸石修复材料对土壤中镉的稳定化研究[J].农业环境科学学报,2016,35(5):907-912,6.基金项目
科技部十二五水专项（2014ZX07602004）；湖南农业大学人才科学基金项目 （）
