水源水库沉积物中稀土元素含量及赋存形态分析——以汤峪水库为例

发布时间：2018-03-28 10:41

本文选题：汤峪水库　切入点：稀土元素　出处：《环境科学学报》2016年12期

【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 contents and speciation of rare earth elements in sediments of Tangyu Reservoir in Lantian County, Xi'an, were studied by ICP-MS and BCR successive extraction methods, and were compared with the soils of China. The contents of rare earth elements in Weinan loess and Luochuan loess are compared. The results show that the average value of samples is higher than that of Chinese soil and Luochuan loess, and the contents of other rare earth elements are lower than those of Weinan loess except LaCe. The contents of ce in the sediments of Tangyu Reservoir are 211.41 mg 路kg ~ (-1) and 9.99 mg 路kg ~ (-1), respectively, which are higher than those of Chinese soil, Weinan loess and Weinan loess. The anomalous coefficient of ce in Loess Loess of Luochuan is 1.28, which indicates that there is enrichment of ce. According to the analysis of BCR's continuous extraction method, the ratio of acid extractable form of Gd is higher than that of other forms of Gd, and the possibility of migration of Gd from sediment to overlying water is stronger. The source indication analysis shows that the REE material source in the sediments of Tangyu reservoir is similar to that of Luochuan loess.
【作者单位】：榆林学院建筑工程学院;西安建筑科技大学西北水资源与环境生态教育部重点实验室;
【基金】：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)~~
【分类号】：X524

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