Sequential chemical extraction and mineralogical bonding of metals from Styrian soils
| Autor: | Daniel Vollprecht, Martin Wellacher, C. Riegler, F. Ahr, S. Stuhlpfarrer |
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| Rok vydání: | 2020 |
| Předmět: |
Environmental Engineering
Olivine Compost Extraction (chemistry) chemistry.chemical_element Manganese Electron microprobe 010501 environmental sciences engineering.material 010502 geochemistry & geophysics 01 natural sciences Metal Adsorption chemistry visual_art Environmental chemistry ddc:540 Soil water visual_art.visual_art_medium engineering Environmental Chemistry General Agricultural and Biological Sciences 0105 earth and related environmental sciences |
| Zdroj: | International Journal of Environmental Science and Technology. 17:3663-3676 |
| ISSN: | 1735-2630 1735-1472 |
| DOI: | 10.1007/s13762-020-02694-0 |
| Popis: | Geogenic metal contaminations in soils are intensely discussed in waste management, as the recyclability of excavated soil is regulated by limit values for pseudo-total contents in Austria. However, the use of pseudo-total contents overestimates the release of some contaminants such as metals into the environment. Sequential extraction provides an empiric tool to better assess the mobility of metals and predicts their bonding type in individual fractions, but the relation between the obtained fractions and the exact mineralogical bonding is often unclear. Electron microprobe analyses provide detailed mineralogical insights, but do not yield direct information about the mobility of elements. A combination of both methods has been used a few times in soil sciences in general, but never to Styrian soils. Thus, six geogenic contaminated Styrian soils and one compost soil were investigated by a method combination of sequential chemical extraction and electron microprobe analyses. Sequential extraction suggested that Cr in five substrates and As and Ni in one substrate each are bound in stable crystalline minerals, whereas Pb in four samples and Cu in two samples are adsorbed to iron and manganese hydroxides. Elemental mappings obtained by electron microprobe analyses confirmed sequential chemical extraction results and specified that Cu and Pb are bound to manganese (hydr)oxides, As to Fe–Cu–Sb–S compounds, Cr to spinels and Ni to olivine. In summary, the current study gives new information about the mobility and mineralogy of metals in six Styrian soils which is relevant for their possible recycling despite exceeded limit values for pseudo-total content. |
| Databáze: | OpenAIRE |
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