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Assessing Soil Quality and Heavy Metal Contamination on Scheelite Mining Sites in a Tropical Semi-arid Setting
Water, Air, & Soil Pollution ( IF 2.9 ) Pub Date : 2021-09-03 , DOI: 10.1007/s11270-021-05299-6
Alana Rayza Vidal Jerônimo do Nascimento 1 , Giulliana Karine Gabriel Cunha 1 , Karina Patrícia Vieira da Cunha 1, 2 , Clístenes Williams Araújo do Nascimento 3
Affiliation  

The study area lies in a semi-arid setting of Brazil that comprises some of the largest scheelite mines in the country, but information regarding the mining impacts on the soil quality are relatively scarce. Here, we studied the changes in the soil physical and chemical characteristics caused by the scheelite mining activities in northeast Brazil, including the impacts on heavy metal concentrations in soils. Soil quality was evaluated in three sites: non-mining (reference), mining, and post-mining. The soil samples were physically and chemically characterized and had their content of the heavy metals Cd, Cr, Cu, Ni, Pb, and Zn determined. The results showed that mining activities significantly impacted soil quality. The main environmental degradation caused by scheelite mining was soil compaction, alkalization, and decreasing of soil organic matter, nitrogen, and phosphorus contents. Besides, the soil concentrations of Cd, Cr, Cu, Ni, Pb, and Zn were higher than the soil guideline values (SGVs) for metals proposed by the Environmental Protection Agency of Brazil. The soil characteristics varied widely in the three conditions of the study (non-mining, mining, and post-mining); therefore, our data provide a base for soil quality assessments of areas impacted by scheelite mining. Due to the improvement in soil physical and chemical characteristics promoted by the spontaneous vegetation cover of old tailings piles, the post-mining sites were statistically grouped with the non-mining areas. Such a result highlights the crucial role that vegetation plays in the recovery of mined sites.



中文翻译:

评估热带半干旱环境中白钨矿矿区的土壤质量和重金属污染

研究区域位于巴西的半干旱环境中,其中包括该国一些最大的白钨矿矿,但有关采矿对土壤质量影响的信息相对稀少。在这里,我们研究了巴西东北部白钨矿开采活动引起的土壤物理和化学特征的变化,包括对土壤中重金属浓度的影响。在三个地点评估土壤质量:非采矿(参考)、采矿和采矿后。对土壤样品进行物理和化学表征,并测定其重金属 Cd、Cr、Cu、Ni、Pb 和 Zn 的含量。结果表明,采矿活动显着影响土壤质量。白钨矿开采造成的主要环境退化是土壤板结、碱化、土壤有机质、氮、磷含量降低。此外,土壤中 Cd、Cr、Cu、Ni、Pb 和 Zn 的浓度高于巴西环境保护局提出的金属土壤准则值(SGVs)。研究的三种条件(非采矿、采矿和采矿后)的土壤特征差异很大;因此,我们的数据为受白钨矿开采影响的地区的土壤质量评估提供了基础。由于老尾矿堆自发植被覆盖促进了土壤理化特性的改善,将采后场地与非采区进行了统计分组。这样的结果凸显了植被在矿区恢复中的关键作用。Cr、Cu、Ni、Pb 和 Zn 高于巴西环境保护署提出的金属土壤准则值 (SGV)。研究的三种条件(非采矿、采矿和采矿后)的土壤特征差异很大;因此,我们的数据为受白钨矿开采影响的地区的土壤质量评估提供了基础。由于老尾矿堆自发植被覆盖促进了土壤理化特性的改善,将采后场地与非采区进行了统计分组。这样的结果凸显了植被在矿区恢复中的关键作用。Cr、Cu、Ni、Pb 和 Zn 高于巴西环境保护署提出的金属土壤准则值 (SGV)。研究的三种条件(非采矿、采矿和采矿后)的土壤特征差异很大;因此,我们的数据为受白钨矿开采影响的地区的土壤质量评估提供了基础。由于老尾矿堆自发植被覆盖促进了土壤理化特性的改善,将采后场地与非采区进行了统计分组。这样的结果凸显了植被在矿区恢复中的关键作用。研究的三种条件(非采矿、采矿和采矿后)的土壤特征差异很大;因此,我们的数据为受白钨矿开采影响的地区的土壤质量评估提供了基础。由于老尾矿堆自发植被覆盖促进了土壤理化特性的改善,将采后场地与非采区进行了统计分组。这样的结果凸显了植被在矿区恢复中的关键作用。研究的三种条件(非采矿、采矿和采矿后)的土壤特征差异很大;因此,我们的数据为受白钨矿开采影响的地区的土壤质量评估提供了基础。由于老尾矿堆自发植被覆盖促进了土壤理化特性的改善,将采后场地与非采区进行了统计分组。这样的结果凸显了植被在矿区恢复中的关键作用。采矿后的地点在统计上与非采矿区分组。这样的结果凸显了植被在矿区恢复中的关键作用。采矿后的地点在统计上与非采矿区分组。这样的结果凸显了植被在矿区恢复中的关键作用。

更新日期:2021-09-03
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