环境工程学报2016，Vol.10Issue(10)：6035-6041,7.DOI:10.12030/j.cjee.201505010
土壤pH和Eh对重金属铬(Ⅵ)纵向迁移及转化的影响
Influence of soils pH and Eh on vertical migration and transformation of Cr(Ⅵ)
摘要
Abstract
The pH and redox potential (Eh) of soil significantly influence the migration and transformation of Cr6+.To investigate the vertical migration and transformation of Cr6+ in soil under different initial pH and Eh conditions,a soil-column leaching experiment was undertaken with indoor continuous rainfall and five types of soil.Soil samples were obtained at different times and depths,then dissolved and filtered to obtain a supernatant,the Cr concentration of which was subsequently evaluated by atomic absorption spectroscopy.It was determined that Cr6+ is absorbed better in the acid soil,Cr6+ migrates fastest in the oxidized soil,and high levels of Cr3+ are transformed from Cr6 + in the reducing condition.Accordingly,the migration and transformation of Cr6 + can be effectively controlled by adjusting the pH and Eh of soil.On one hand,reducing the adsorption capacity of soil by increasing its pH value,as well as accelerating Cr6+ leaching out from soil,is effective;on the other hand,reducing the Eh value of soil can promote the transformation of Cr6+ to Cr3+,which has less toxicity.Therefore,in this way,soil Cr-contamination can be mitigated and its quality improved.关键词
铬(Ⅵ)/土柱实验/土壤pH/Eh/迁移Key words
Cr6+/soil-column experiment/soil pH/Eh/migration分类
资源环境引用本文复制引用
王成文,许模,张俊杰,丁庆忠,凌睿雯,郭蕾蕾..土壤pH和Eh对重金属铬(Ⅵ)纵向迁移及转化的影响[J].环境工程学报,2016,10(10):6035-6041,7.基金项目
成都理工大学地质灾害防治与地质环境保护国家重点实验室团队重点课题(SKLGP20112001) （SKLGP20112001）
