淤泥中吸附铬的存在形态及其影响因素研究  

The existing forms of adsorbed Cr in sediment

作　　者：王校常[1] 孙锦荷[1] 陈子元[1] 

机构地区：[1]浙江农业大学原子核农业科学研究所

出　　处：《核技术》1995年第4期251-255,共5页Nuclear Techniques

基　　金：国际原子能机构协作课题

摘　　要：利用连续提取和同位素示踪技术研究了淤泥中吸附Ｃｒ的存在形态及ｐＨ和浓度对其的影响．结果表明，吸附铬在各形态间的分配顺序为：Ｆｅ／Ｍｎ氧化物志＞有机结合态、碳酸盐结合态＞残余态＞可交换态．无论是Ｃｒ（Ⅵ），还是Ｃｒ（Ⅲ），浓度和ｐＨ都明显影响淤泥对它们的吸附，但并不明显改变吸附铬在各存在形态间的分配比．铁锰氧化物和有机质是淤泥吸附格的主要介质．The existing forms of adsorbed Cr and the effect of PH value and Cr(Ⅵ) concentration on the forms were studied using sequential extraction and isotopic tracer technique. It was shown that the order of Cr adsorbed in different phases was Fe/Mn oxide>organic, and carbonate>residual>exchangeable. Adsorption of Cr in sediment was controlled by Cr(Ⅵ) concentration and pH value, but the distribution of Cr adsorbed in various phases was independent of these factors.Fe/Mn oxide and organic matter were the main adsorbent of Cr in sediment.

关 键 词：淤泥 吸附铬 形态分布 连续提取 铬51 

分 类 号：X131[环境科学与工程—环境科学] X833