Fernández-Martínez Rodolfo, Loredo Jorge, Ordóñez Almudena, Rucandio María Isabel
Analytical Chemistry Laboratory, Department of Environmental Impact of Energy, CIEMAT, Avda Complutense 22, Ed.70. E-28040 Madrid, Spain.
Environ Pollut. 2006 Jul;142(2):217-26. doi: 10.1016/j.envpol.2005.10.034. Epub 2005 Dec 15.
Soils from old cinnabar mining areas usually exhibit high Hg contents, whose mobility depends on soil parameters and environmental conditions. This paper presents the study of the Hg speciation in soil samples from an abandoned Hg mine and metallurgical plant in Mieres (Asturias, Spain), in relation to their mineralogical and chemical composition and their particle-size distribution. A characterization of samples was made by X-Ray Diffraction Spectrometry, Scanning Electron Microscopy and Atomic Absorption and Emission Spectroscopy analyses. A sequential extraction method was applied to establish Hg mobility in the samples and their grain-size subsamples. The highest Hg mobility was found in well-developed soils, as a consequence of the adsorption processes by iron and manganese oxides, whereas in those more contaminated soils, a higher proportion of Hg was leached in the non-mobile fraction. A higher Hg mobility was found in the finest grain-size subsamples, probably due to the accumulation of clay minerals and oxides in these ranges.
旧朱砂矿区的土壤通常汞含量较高，其迁移性取决于土壤参数和环境条件。本文介绍了对西班牙阿斯图里亚斯米耶雷斯一个废弃汞矿和冶炼厂土壤样品中汞形态的研究，该研究涉及土壤的矿物学和化学成分及其粒度分布。通过X射线衍射光谱法、扫描电子显微镜以及原子吸收和发射光谱分析对样品进行了表征。采用连续萃取法来确定样品及其粒度子样品中汞的迁移性。在发育良好的土壤中发现汞的迁移性最高，这是铁和锰氧化物吸附过程的结果，而在那些污染更严重的土壤中，较高比例的汞在非迁移部分被浸出。在粒度最细的子样品中发现汞的迁移性更高，这可能是由于这些范围内粘土矿物和氧化物的积累。
