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Metal(loid)s remobilization and mineralogical transformations in smelter-polluted savanna soils under simulated wildfire conditions
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SYSNO ASEP 0555414 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Metal(loid)s remobilization and mineralogical transformations in smelter-polluted savanna soils under simulated wildfire conditions Author(s) Tuhý, M. (CZ)
Ettler, V. (CZ)
Rohovec, Jan (GLU-S) RID, SAI
Matoušková, Šárka (GLU-S) RID, SAI
Mihaljevič, M. (CZ)
Kříbek, B. (CZ)
Mapani, B. (NA)Article number 112899 Source Title Journal of Environmental Management. - : Elsevier - ISSN 0301-4797
Roč. 293, September (2021)Number of pages 10 s. Publication form Print - P Language eng - English Country GB - United Kingdom Keywords Wildfire ; Soil ; Metal(loid)s ; Remobilization ; Smelter pollution OECD category Environmental sciences (social aspects to be 5.7) Method of publishing Limited access Institutional support GLU-S - RVO:67985831 UT WOS 000677980900002 EID SCOPUS 85107693041 DOI 10.1016/j.jenvman.2021.112899 Annotation The surroundings of mines and smelters may be exposed to wildfires, especially in semi-arid areas. The temperature-dependent releases of metal(loid)s (As, Cd, Cu, Pb, Zn) from biomass-rich savanna soils collected near a Cu smelter in Namibia have been studied under simulated wildfire conditions. Laboratory single-step combustion experiments (250–850 ◦C) and experiments with a continuous temperature increase (25–750 ◦C) were coupled with mineralogical investigations of the soils, ashes, and aerosols. Metals (Cd, Cu, Pb, Zn) were released at >550–600 ◦C, mostly at the highest temperatures, where complex aerosol particles, predominantly composed of slag-like aggregates, formed. In contrast, As exhibited several emission peaks at ~275 ◦C, ~370–410 ◦C, and ~580 ◦C, reflecting its complex speciation in the solid phase and indicating its remobilization, even during wildfires with moderate soil heating. At <500 ◦C, As was successively released via the transformation of As-bearing hydrous ferric oxides, arsenolite (As2./subO3) grains attached to the organic matter fragments, metal arsenates, and/or As-bearing apatite, followed by the thermal decomposition of enargite (Cu3AsS4) at >500 ◦C. The results indicate that the active and abandoned mining and smelting sites, especially those highly enriched in As, should be protected against wildfires, which can be responsible for substantial As re-emissions. Workplace Institute of Geology Contact Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Year of Publishing 2022 Electronic address https://www.sciencedirect.com/science/article/pii/S0301479721009610?via%3Dihub
Number of the records: 1