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Título: | Thallium occurrence and partitioning in soils and sediments affected by mining activities in Madrid province (Spain) |
Autor: | Gómez-González, Miguel A. CSIC ORCID; García-Guinea, Javier CSIC ORCID ; Laborda, Francisco; Garrido, Fernando CSIC ORCID | Fecha de publicación: | 25-jul-2015 | Editor: | Elsevier | Citación: | Science of the Total Environment 536: 268-278 (2015) | Resumen: | © 2015 Elsevier B.V. Thallium (Tl) and its compounds are toxic to biota even at low concentrations but little is known about Tl concentration and speciation in soils. An understanding of the source, mobility, and dispersion of Tl is necessary to evaluate the environmental impact of Tl pollution cases. In this paper, we examine the Tl source and dispersion in two areas affected by abandoned mine facilities whose residues remain dumped on-site affecting to soils and sediments of natural water courses near Madrid city (Spain). Total Tl contents and partitioning in soil solid phases as determined by means of a sequential extraction procedure were also examined in soils along the riverbeds of an ephemeral and a permanent streams collecting water runoff and drainage from the mines wastes. Lastly, electronic microscopy and cathodoluminescence probe are used as a suitable technique for Tl elemental detection on thallium-bearing phases. Tl was found mainly bound to quartz and alumino-phyllosilicates in both rocks and examined soils. Besides, Tl was also frequently found associated to organic particles and diatom frustules in all samples from both mine scenarios. These biogenic silicates may regulate the transfer of Tl into the soil-water system. | URI: | http://hdl.handle.net/10261/122977 | DOI: | 10.1016/j.scitotenv.2015.07.033 | Identificadores: | doi: 10.1016/j.scitotenv.2015.07.033 e-issn: 1879-1026 issn: 0048-9697 |
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