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研究报告

The concentrations and speciations of rare earth elements in the sediment of Tangyu Reservoir

基金项目：国家自然科学基金（No.41373093）；陕西省自然科学基金（No.2011JM5004）；西北旱区生态水利工程国家重点实验室培育基地开放研究基金（No.2013KFKT-3）

摘要：利用ICP-MS和BCR连续提取法分别研究了西安蓝田汤峪水库沉积物中稀土元素含量和形态分布特征，并与中国土壤、渭南黄土和洛川黄土稀土元素含量进行了比较.结果表明：样品平均值均高于中国土壤和洛川黄土稀土元素含量，除La、Ce外，其它稀土元素均低于渭南黄土稀土元素含量；其中，Ce的含量分别是中国土壤、渭南黄土、洛川黄土的1.49、1.28和1.63倍.汤峪水库沉积物中稀土元素总量（∑REE）达211.41 mg·kg^-1，∑LREE/∑HREE为9.99，均高于中国土壤、渭南黄土、洛川黄土；Ce的异常系数值为1.28，表明存在Ce的富集.由BCR连续提取法分析可知，Gd的酸可提取态（F1）比例高于其它形态，Gd由沉积物中向上覆水体迁移的可能性较强，产生的潜在环境效应也最明显.物源指示分析表明，汤峪水库沉积物中的稀土元素物质来源与洛川黄土相似.

Abstract：The concentrations and speciation of rare earth elements (REEs) in the sediment of Tangyu Reservoir were studied by using ICP-MS and BCR sequential extraction method, and the results were compared with the REEs reference concentrations (background values of REEs in China soil, Weinan loess and Luochan loess). The results show that the average concentrations of the REEs in the sediment of Tangyu Reservoir were higher than those of Chinese soil and Luochuan loess, except for La and Ce. The concentration of Ce was obviously higher than the backgroud value, which was 1.49, 1.28 and 1.63 times of concentrations in Chinese soil, Weinan loess and Luochuan loess, respectively. The total REEs concentration (∑REE) in the sediment of Tangyu Reservoir was 211.41 mg·kg^-1 And the value of ∑LREE/∑HREE was 9.99, both of which were higher than those of Chinese soil, Weinan loess and Luochuan loess respectively. The abnormal coefficient value of Ce was 1.28, which indicates the enrichment of Ce. The analysis results based on BCR sequential extraction method show that the F1 percentage of Gd was higher than other forms, so the possibility of Gd migration from sediment to overlying water was strong and the potential ecological risk was high. Source indication analysis indicates that the sediment source of Tangyu Reservoir was similar to the source of Luochuan loess.