土壤中稀土元素赋存状态的研究

土壤中稀土元素赋存状态的研究

摘要

摘要: 采用连续提取法，将土壤中稀土元素的赋存状态分为七种形态，即：（Ⅰ）水溶态、（Ⅱ）可交换态、（Ⅲ）松结有机态、（Ⅳ）碳酸盐结合态和专性吸附态、（Ⅴ）铁锰氧化态、（Ⅵ）紧结有机态和（Ⅶ）残渣态。用中子活化分析（ＮＡＡ）测定了各形态中稀土元素的含量，并探讨了红壤、黄棕壤和淋溶黑钙土等土壤中各稀土元素的赋存状态。研究结果表明，三种类型土壤中，稀土元素均以残渣态为主要赋存状态（＞６０％），而水溶态中的稀土元素含量极微。

Abstract: STUDY ON SPECIATION OF RARE EARTH ELEMENTS IN SOLLWang Yuqi;Sun Jingxin;Chen Hongmin;Guo Fanqing（Institute of High Energy Physics, Laboratory of Nuclear Analysis Techniques,the Chinese Academy of Sciences,Beijing 100080）Wang Lijun;Zhang Shen(Institute of Geography,the Chinese Academy of Sciences,Beijing 10001）Abstract:The contents of rare earth elements（REE）in red soil,yellow brown soil and leached chernozem are studied．After extracted sequentially,REE in these soils are fractionated into seven forms,i．e,（Ⅰ）water soluble,（Ⅱ）exchangeable,（Ⅲ）loosely bound to organic mat ter,（Ⅳ）bound to carbonate and specifically absorbed,（Ⅴ）bound to Fe-Mn oxides,（Ⅵ）tightly bound to organic matter and（Ⅶ） residual forms,The contents of REE in every form are determind by NAA（neutron activation analysis）．The results show that REE in soils mainly exist in residual form and REE in Soluble forms are very limited（＜7％）.Keywords:NAA REE Speciation Soil

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