土壤中稀土元素的形态分析  

Speciation Analysis of Rare Earth Elements in Soil

作　　者：郭鹏然[1,2] 贾晓宇[1,2] 段太成[1] 张翼明[3] 许涛[3] 陈杭亭[1,4] 

机构地区：[1]中国科学院长春应用化学研究所,国家电化学和光谱研究分析中心,长春130022 [2]中国科学院研究生院,北京100039 [3]包头稀土研究院理化检测中心,包头014010 [4]中国科学院长春应用化学研究所,电分析化学国家重点实验室,长春130022

出　　处：《分析化学》2008年第11期1483-1487,共5页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金(Nos.20677057;20605021)资助项目

摘　　要：稀土元素对土壤环境的影响不但与其总量有关,而且与其化学形态关系更为密切。分别采用酸法消解和形态连续提取法对土壤样品中稀土元素总量和稀土元素的形态进行提取分析,并利用电感耦合等离子体质谱法测定了土壤样中稀土元素含量和稀土元素各形态含量。结果表明,采集土壤样品中稀土元素含量为200-1418 mg/kg,轻稀土元素含量远高于重稀土元素;稀土元素各结合形态总和相对于总量的回收率为88.2%-110%,表明采用的连续萃取法适合土壤样品中稀土元素的分析。土壤样品中稀土元素主要以残渣态存在,为33%-80%;晶体铁锰氢氧化物共沉淀态为10%-31%;腐殖质和无定形氧化物吸附态为5.0%-18%;可交换态和碳酸盐结合态为4.0%-23%;无定形铁锰氧化物共沉淀态低于3%。分析了采样点位置和稀土元素性质对稀土元素含量的影响,并讨论了土壤性质对形态分布的影响。The influence of rare earth elements （REEs） on soil environment has more close relationship with bound fractions than total contents. Acid digestion and a sequential extraction procedure were employed to evaluate the total contents and fractions of REEs in soil, respectively, then the contents of REEs in soil samples and fractions extracted were determined by inductively couple plasma mass spectroscopy. Results showed that the contents of REEs in the soil samples sampling from Baotou Industry Areas were in the range of 200 - 1418 mg/kg, and light REEs were much higher than heavy REEs. The recovery ratios of the sum of fractions to total content of REEs were in the range of 88.2% - 110% , which indicated the sequential extraction method was suited to quantify the fractions of REEs in soil. Residual fraction of REEs was the primary form, which was in the range of 33% -80%; the percent of crystalline ferromanganese oxyhydroxides fraction, adsorbed in humic material and amorphous oxides fraction, exchangeable and carbonates fractions was 10% -31%, 5.0% -18% and 4.0% -23%, respectively; fraction coprecipitated with amorphous ferromanganese oxyhydroxidc was less than 3%. The effects of sampling sites and REEs properties on contents and soil properties on the distribution of fractions were discussed.

关 键 词：电感耦合等离子体质谱法 连续萃取 稀土元素 形态分析 土壤 

分 类 号：X833[环境科学与工程—环境工程]