六价铬在铁锰结核中的迁移转化研究  

Migration and conversion of Cr (Ⅵ) in Fe-Mn nodule

作　　者：黄琼瑶[1,2] 唐建生[1] 时坚[1] 邹胜章[1] 苏春田[1] 

机构地区：[1]中国地质科学院岩溶地质研究所,广西桂林541004 [2]广西师范大学生命科学学院,广西桂林541004

出　　处：《广西农业科学》2009年第2期184-189,共6页Guangxi Agricultural Sciences

基　　金：广西科学基金资助项目(桂科基0639066);中国地质调查项目(1212010634803)

摘　　要：为进一步了解Cr(Ⅵ)在铁锰结核中的迁移转化规律,以广西黎塘桥美老村的铁锰结核为材料,研究铁锰结核对Cr(Ⅵ)的动态吸附解吸行为。结果表明,铁锰结核对Cr(Ⅵ)有明显的吸附作用,最大吸附率达62%,但同时也不容易被一些解吸剂解吸,用去离子水解吸时,其最大解吸率为11.144%;用模拟酸雨解吸时,其最大解吸率为2.463%。这说明六价铬在铁锰结核中的吸附主要以专性吸附为主,被铁锰结核吸附后的六价铬不稳定,容易迁移转化。In order to understand the rules of the migration and conversion of Cr（ Ⅵ ） in Fe-Mn nodule, the behavior of Cr （ Ⅵ） adsorption and desorption in Fe-Mn nodule taken from Qiaomei Village of Litang, Guangxi were studied. The results showed that Fe-Mn nodule had significant adsorption effects on Cr （ Ⅵ）, and the maximum adsorption rate reached 62%. Meanwhile, it was not easy to be desorped by some desorption agent, the maximum desorption rate was 11.144% by deionized water, and the maximum desorption rate was 2.463% by simulated acid rain. The results proved that the adsorption of Cr（ Ⅵ） in Fe-Mn nodule was dominant in specific adsorption. Those Cr （ Ⅵ） adsorped by Fe-Mn nodule was unstable and could be easily migrated into the other forms.

关 键 词：铁锰结核 吸附 解吸 

分 类 号：S153[农业科学—土壤学]