感耦等离子体发射光谱法研究土壤—铁芒萁系统中稀土元素的分布、累积和迁移特征

用感耦等离子体发射光谱法（ICP－AES）测定了东西赣南地区非稀土矿区和4处不同稀土矿区内，土壤－铁芒萁系统中La、Ce、Pr、Nd、Sm、Gd、Dy、Yb和Y的含量，并对其在土壤剖面层及铁芒萁植物体内的分布、迁移特征进行了研究，结果表明，土训层的底土层含量最高，但表土层铈相对富集、稀土元素总量（∑REE）在铁芒萁植物体内的分布规律是叶＞根＞茎＞叶柄，单一稀土的分布规律各异，La、Ce、Pr、Nd的分布规律表现为：叶＞根＞茎＞叶柄；Sm和Gd在不同采样点表现为叶＞根＞茎＞叶柄或根＞叶＞茎＞叶柄；Dy、Yb和Y均有3种不同的分布模式：叶＞根＞茎＞叶柄、根＞叶＞茎＞叶柄及根＞茎＞叶＞叶柄，稀土元素在铁芒萁体内的迁移过程中，发生了明显的分馏作用，茎、叶柄、叶中的重稀土相对贫乏。

ICP-AES studies on characteristics of distribution, accumulation and transportation of rare earth elements in soil-Dicranopteris dichotoma system.

The contents of La,Ce,Pr,Nd,Sm,Gd,Dy,Yb and Y in soils and Dicranopteris dichotoma collected from 4 rare earth mining areas and 1 non-mining area in south Jiangxi Province were determined using the inductively coupled plasma atomic emission spectrometry(ICP-AES) method,and the distribution patterns and transportation characteristics of the rare earth elements (REEs) in soil profiles and Dicranopteris dichotoma tissues were discussed.The results showed that the REEs contents in the C horizon the soils were the highest,but Ce was relatively concentrated in A horizon.The total amount of the REEs in Dicranopteris dichotoma tissues was in order of leaf>root>stem>leaf stalk,but the distribution patterns of individual REE were various,ie.,La,Ce,Pr and Nd,leaf>root>stem>leaf stalk,Sm and Gd,leaf>root>stem>leaf stalk or root>leaf>stem>leaf stalk,and Dy,Yb and Y,leaf>root>stem>leaf stalk,root>leaf>stem>leaf stalk,or root>stem>leaf>leaf stalk.The REEs were obviously fractionated in their transportion processes in Dicranopteris dichotoma tissues and heavy REEs in stems,leaf stalks and leaves of the plant were relatively poor.