摘要
实验研究了轻稀土镧离子Ｌａ~３＋和重稀土镱离子Ｙｂ~３＋在赣南稀上矿区的土壤及风化次生矿物中的吸附特性，结果表明，土壤和矿物对稀土元素的吸附过程符合Ｌａｎｇｍｕｉｒ和Ｆｒｅｎｄｌｉｃｈ等温吸附方程，ｐＨ值是影响吸附作用的主要因素。随着ｐＨ值的变化，Ｌａ~３＋和Ｙｂ~３＋在土壤和次生矿物上的吸附能力也发生变化。Ｌａ~３＋与Ｙｂ~３＋在土壤和次生矿物中的吸附等势点ｐＨ值分别为６．２６和５．２８．在等势点ｐＨ值以下，Ｌａ~３＋的吸附势大于Ｙｂ~３＋；在等势点ｐＨ值以上，Ｙｂ~３＋的吸附势相对较高。土壤和次生矿物对轻、重稀土元素的吸附特征以及对稀士元素的分布、分异、成矿和生态效应具有重要意义。
The adsorption of light rare earth elements(LREE)La3+ and heavy rare earth elements (HREE)Yb3+ on soil andweathering mineral(<63 m) of REE mine area in southem Jiangxi province was studied by experimental approach.Results showed that langmuir and Frendlich equations were fitable to the adsorption procedure and that PH value is theimportant factor to effect adsorption. With the PH value changed, the adsorption capacity of La3+ and Yb3+ also changes.The adsorption epuipotential points of La3+ and Yb3+ on soil and mineral are PH 6.26 and PH5.28, respectively. Under thePH value of equiqutential point the adsorption capacity of La3+ is higher than Yb3+;on the contrast, it is converse.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
1999年第2期149-152,共4页
China Environmental Science
基金
国家自然科学基金重大资助项目!19392100
国家自然科学基金!49771070
关键词
稀土元素
土壤
矿物
吸附
污染
镧
钇
rare earth elements(REE)
adsorption
soil and mineral
