Olías M, Cerón J C, Fernández I, De la Rosa J
Departamento de Geodinámica y Paleontología, Universidad de Huelva, Avda. de las Fuerza Armadas s/n, 21071 Huelva, Spain.
Environ Pollut. 2005 May;135(1):53-64. doi: 10.1016/j.envpol.2004.10.014.
This work analyses the spatial distribution, the origin, and the shale-normalised fractionation patterns of the rare earth elements (REE) in the alluvial aquifer of the Guadiamar River (south-western Spain). This river received notoriety in April 1998 for a spill that spread a great amount of slurry (mainly pyrites) and acid waters in a narrow strip along the river course. Groundwaters and surface waters were sampled to analyse, among other elements, the REEs. Their spatial distribution shows a peak close to the mining region, in an area with low values of pH and high concentrations of sulphates and other metals such as Zn, Cu, Co, Ni, Pb, and Cd. The patterns of shale-normalised fractionation at the most-contaminated points show an enrichment in the middle rare earth elements (MREE) with respect to the light (LREE) and heavy (HREE) ones, typical of acid waters. The Ce-anomaly becomes more negative as pH increases, due to the preferential fractionation of Ce in oxyhydroxides of Fe.
这项工作分析了瓜迪亚马尔河（西班牙西南部）冲积含水层中稀土元素（REE）的空间分布、来源及页岩标准化分馏模式。1998年4月，这条河因一次泄漏事件而声名狼藉，大量矿泥（主要是黄铁矿）和酸性水沿着河道在一条狭长地带扩散。对地下水和地表水进行了采样，以分析稀土元素及其他元素。它们的空间分布显示，在靠近矿区的一个pH值较低、硫酸盐及锌、铜、钴、镍、铅和镉等其他金属浓度较高的区域出现了一个峰值。在污染最严重的点，页岩标准化分馏模式显示，相对于轻稀土元素（LREE）和重稀土元素（HREE），中稀土元素（MREE）富集，这是酸性水的典型特征。由于铈在铁的氢氧化物中优先分馏，随着pH值升高，铈异常变得更加负向。
