对我国二十种土壤中稀土元素形态分组的研究  

Study of Rare Earths Fractionation in 20 Types of Soils of China

作　　者：翟海[1] 杨永岗[1] 胡霭堂[1] 

机构地区：[1]南京农业大学自然资源与环境科学学院,江苏南京210095

出　　处：《稀土》2001年第3期1-5,共5页Chinese Rare Earths

基　　金：国家自然科学基金资助项目 !(193 92 10 0 )

摘　　要：本文提出了土壤中稀土元素形态分组的方法 ,对我国 2 0种土壤中稀土元素形态分组特征进行了评价。结果表明 ,土壤中稀土元素主要以残渣态存在 ,其次为氧化铁结合态和松结有机态。在碱性土壤中碳酸盐结合态仅次于氧化铁结合态 ,中酸性土壤中紧结有机态仅次于松结有机态 ,而碱性土壤中紧结有机态极低。A sequential extraction procedure was developed for fractionation of rare earths in soil.RE forms in 20 types of soils have been studied using this method.The result shows that the main part of total RE in soil is in residue form,its distribution ratio accounts to 56.59±10.37%.The followings are Fe oxide bond and weak bond in organic matter forms.The amount of carbonate bond and strong bond in organic matter forms depends on soil types.Exchangeable and Mn oxide bond forms are low in soils.Exchangeable forms vary strongly in different types of soils,its C.V.could be 122% in 20 types of soils.

关 键 词：稀土元素 形态分组 土壤 生态环境效应 环境化学行为 存在形态 

分 类 号：S153.61[农业科学—土壤学] X144[农业科学—农业基础科学]