Prudêncio Maria Isabel, Valente Teresa, Marques Rosa, Sequeira Braga Maria Amália, Pamplona Jorge
Centro de Ciências e Tecnologias Nucleares (C2TN), Instituto Superior Técnico, Universidade de Lisboa, Estrada Nacional 10 (km 139.7), 2695-066 Bobadela, Portugal.
Instituto de Ciências da Terra (ICT), Polo da Universidade do Minho, Departamento de Ciências da Terra, Universidade do Minho, Campus de Gualtar, 4710-057 Braga, Portugal.
Chemosphere. 2015 Nov;138:691-700. doi: 10.1016/j.chemosphere.2015.07.064. Epub 2015 Aug 3.
Rare earth elements (REE) were used to assess attenuation processes in a passive system for acid mine drainage treatment (Jales, Portugal). Hydrochemical parameters and REE contents in water, soils and sediments were obtained along the treatment system, after summer and winter. A decrease of REE contents in the water resulting from the interaction with limestone after summer occurs; in the wetlands REE are significantly released by the soil particles to the water. After winter, a higher water dynamics favors the AMD treatment effectiveness and performance since REE contents decrease along the system; La and Ce are preferentially sequestered by ochre sludge but released to the water in the wetlands, influencing the REE pattern of the creek water. Thus, REE fractionation occurs in the passive treatment systems and can be used as tracer to follow up and understand the geochemical processes that promote the remediation of AMD.
稀土元素（REE）被用于评估葡萄牙贾莱斯一个用于酸性矿山排水处理的被动系统中的衰减过程。在夏季和冬季过后，沿着处理系统获取了水、土壤和沉积物中的水化学参数以及稀土元素含量。夏季过后，与石灰石相互作用导致水中稀土元素含量下降；在湿地中，土壤颗粒会将稀土元素大量释放到水中。冬季过后，较高的水流动力学有利于酸性矿山排水的处理效果和性能，因为稀土元素含量沿系统降低；镧和铈优先被赭石污泥截留，但在湿地中会释放到水中，影响溪流水的稀土元素模式。因此，在被动处理系统中会发生稀土元素分馏，并且可以用作追踪和理解促进酸性矿山排水修复的地球化学过程的示踪剂。
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