摘要
六价铬(Cr^6+)是铬在自然界中最为常见的一个价态,毒性大、易迁移,且生物可利用,对人体和环境有很大危害。将其转化为氢氧化铬(Cr(OH)3)并沉淀是对Cr^6+污染土壤处理的重要方法。但因土壤中有着天然氧化剂,在还原处理后会出现再氧化的情况。本文在分析Cr^6+污染土壤还原处理后再氧化的潜在因素基础上,对土壤内铬再氧化机理进行了研究,为更好解决再氧化问题提供了重要指导。
Hexavalent chromium(Cr^6+) is the most common valence state of chromium in nature.It is highly toxic,easy to migrate, and bioavailable,which is very harmful to human body and environment.It is an important method for the treatment of Cr^6+ contaminated soil by converting it into chromium hydroxide(Cr(OH)3) and precipitating it.However,due to the presence of natural oxidants in the soil,reoxidation occurs after reduction.Based on the analysis of the potential factors of reoxidation after reduction treatment of Cr^6+ contaminated soil,the mechanism of chromium reoxidation in soil was studied,which provided important guidance for better solving the problem of reoxidation.
作者
滕蓉雪
Teng Rongxue(Tongren Environmental and Ecological Bureau,Tongren Guizhou 554100,China)
出处
《环境与发展》
2019年第9期114-114,116,共2页
Environment & Development
关键词
六价铬
污染土壤
还原处理
再氧化
Hexavalent chromium
Contaminated soil
Reduction treatment
Reoxidation
