Geochemical Behaviour of Rare Earth Elements Throughout an Acid Mine Drainage Passive Treatment System in the Lousal Mine Area, Portugal

IF 2.1 4区环境科学与生态学 Q3 WATER RESOURCES

Mine Water and the Environment Pub Date : 2023-10-04 DOI:10.1007/s10230-023-00954-2

Cynthia Obregón-Castro, Maria Isabel Prudêncio, Catarina Diamantino, Edgar Carvalho, Dulce Russo, Rosa Marques

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Abstract

Abstract A passive remediation system was installed between 2010 and 2015 at the Lousal legacy mine site in southwestern Portugal to minimize the impact of AMD. This is the first study of the geochemical behaviour of rare earth elements (REE) in the area after implementation of the passive treatment system. The total and dissolved concentrations of REE is similar throughout the basins/wetlands and acidic ponds in both sampling campaigns, which is mainly attributed to the conservative behaviour of these elements in acidic water. In areas where mixing of acidic and circumneutral water occurs, the REE were partially removed from solution by adsorption onto newly formed Al and Fe precipitates. Sorption onto the precipitates varies between the rare earths, with a preferential fixation of heavy REE (HREE) compared to the light REE (LREE). The normalized distribution patterns exhibit the characteristic convex-up enrichment in middle rare earth elements for AMD and display an enrichment of LREE relative to HREE in areas where mixing of waters occurs, and the pH is close to circumneutral.

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稀土元素在葡萄牙Lousal矿区酸性矿井水被动处理系统中的地球化学行为

2010年至2015年间，在葡萄牙西南部的Lousal遗留矿区安装了一个被动修复系统，以最大限度地减少AMD的影响。这是该地区实施被动处理系统后首次对稀土元素的地球化学行为进行研究。在两次采样中，整个盆地/湿地和酸性池塘的稀土元素总浓度和溶解浓度相似，这主要归因于这些元素在酸性水中的保守行为。在酸性水和环中性水混合的区域，稀土元素通过吸附在新形成的Al和Fe沉淀上被部分地从溶液中去除。不同稀土元素对析出物的吸附性不同，重稀土(HREE)比轻稀土(LREE)更倾向于固定。归一化分布模式显示AMD中稀土元素呈凸起富集特征，在水体混合区LREE相对于HREE富集，pH接近环中性。

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来源期刊

Mine Water and the Environment WATER RESOURCES-

CiteScore

5.00

自引率

14.30%

发文量

审稿时长

3 months

期刊介绍： Mine Water and the Environment welcomes original contributions that address either technical questions or practical issues related to the evaluation, prediction, prevention, or control of water problems at mining operations or their impact on the environment. The journal and its audience is interdisciplinary. Manuscripts should convey new technical information and be of potential interest to researchers and/or practitioners in this field. Laboratory and field experiments, modelling efforts, studies of relevant field sites, technical evaluations of new technology, and engineering applications are all appropriate.