【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。土壤中交换态和氧化锰结合态稀土元素均比较低更多还原

【Abstract】 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.更多还原