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Geochemical modeling of soils and technogenic sediments interactions with natural waters using SELECTOR software (Chaabet-el-Hamra mine, Algeria)
Geochemistry ( IF 3.7 ) Pub Date : 2021-07-15 , DOI: 10.1016/j.chemer.2021.125799
Valeriy Bychinsky 1 , Marina Charykova 2 , Rima Omara 2
Affiliation  

In the mining complex of Kherzet Youcef, including the Chaabet-el-Hamra mine and processing plant, chemical analyzes were carried out on soil and sediment samples and exceeded the normative guidelines for zinc, lead, and cadmium except a small area in the foothills. X-ray diffractometer analyzes confirmed the presence of a considerable inclusion of sulfides (up to 20%), such as pyrite, marcasite (FeS2) and sphalerite (ZnS) especially at the liquid waste disposal site and technogenic sediments. To predict changes in the mineral composition of soils and waste under the condition of their contact with rain water and to assess the potential contamination of ground waters, a thermodynamic model SELECTOR was applied on selected samples. The results of this study conclude that the calculated equilibrium mineral composition is very close to the real phase composition only for the least polluted soils. For technogenic sediments or waste, the equilibrium mineral composition differs significantly from the experimental one. The modeling of potential transition of the main pollutants in water soluble forms allows concluding that in the study area should be feared of exceeding of normative guidelines of cadmium, zinc, and lead.



中文翻译:

使用 SELECTOR 软件(Chaabet-el-Hamra 矿,阿尔及利亚)对土壤和技术沉积物与天然水相互作用的地球化学建模

在包括 Chaabet-el-Hamra 矿和加工厂在内的 Kherzet Youcef 采矿综合体中,对土壤和沉积物样本进行了化学分析,除了山麓的一小部分区域外,锌、铅和镉的含量超过了规范指南。X 射线衍射仪分析证实存在大量硫化物(高达 20%),例如黄铁矿、白铁矿 (FeS 2) 和闪锌矿 (ZnS),尤其是在液体废物处理场和技术沉积物。为了预测土壤和废物在与雨水接触的条件下矿物质成分的变化并评估地下水的潜在污染,热力学模型 SELECTOR 应用于选定的样本。这项研究的结果得出的结论是,计算出的平衡矿物组成非常接近于仅对于污染最轻的土壤的真实相组成。对于技术沉积物或废物,平衡矿物成分与实验成分显着不同。水溶性形式的主要污染物的潜在转变模型可以得出结论,在研究区域中,应该担心超过镉、锌和铅的规范指导方针。

更新日期:2021-07-15
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