National Museum of Natural Sciences, CSIC, Jose Gutierrez Abascal 2, 28006 Madrid, Spain.
Group of Analytical Spectroscopy and Sensors Group, Institute of Environmental Sciences, University of Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain.
Sci Total Environ. 2015 Dec 1;536:268-278. doi: 10.1016/j.scitotenv.2015.07.033. Epub 2015 Jul 25.
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.
铊（Tl）及其化合物即使在低浓度下对生物群也具有毒性，但人们对土壤中铊的浓度和形态知之甚少。了解铊的来源、迁移和分散对于评估铊污染情况的环境影响是必要的。在本文中，我们研究了两个受废弃矿山设施影响的地区的铊来源和分散情况，这些设施的残留物仍堆放在现场，影响了马德里市（西班牙）附近自然水道的土壤和沉积物。我们还通过连续提取程序检查了河床土壤中总 Tl 含量及其在土壤固相中的分配，这些河床收集了来自矿山废物的径流水和排水。最后，电子显微镜和阴极发光探针被用作检测含铊相中 Tl 元素的合适技术。在两种岩石和所研究的土壤中，Tl 主要与石英和铝硅酸盐结合。此外，在两个矿山场景的所有样本中，Tl 也经常与有机颗粒和硅藻壳结合。这些生物成因的硅酸盐可能会调节 Tl 向土壤-水系统中的转移。
