Geochemical fractionation of hazardous elements in fresh and drilled weathered South African coal fly ashes
The chemical reactions of dry-disposed ash dump, ingressed oxygen, carbon dioxide, and infiltrating rainwater affect mineralogical transformation, redistribution, and migration of chemical species. Composite samples of weathered coal fly ash taken at various depths and fresh coal fly ash were examin...
- Autores:
-
Akinyemi, S. A.
Gitari, W. M.
Thobakgale, R.
Petrik, L. F.
Nyakuma, B. B.
Hower, J. C.
Ward, C. R.
Silva Oliveira, Marcos Leandro
Silva Oliveira, Luis Felipe
- Tipo de recurso:
- Article of journal
- Fecha de publicación:
- 2020
- Institución:
- Corporación Universidad de la Costa
- Repositorio:
- REDICUC - Repositorio CUC
- Idioma:
- eng
- OAI Identifier:
- oai:repositorio.cuc.edu.co:11323/6938
- Acceso en línea:
- https://hdl.handle.net/11323/6938
https://doi.org/10.1007/s10653-019-00511-3
https://repositorio.cuc.edu.co/
- Palabra clave:
- Weathered ash
Fresh ash
Organic petrography
Sequential extraction
Metal mobility
Mineral transformations
- Rights
- openAccess
- License
- CC0 1.0 Universal
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oai:repositorio.cuc.edu.co:11323/6938 |
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|
dc.title.spa.fl_str_mv |
Geochemical fractionation of hazardous elements in fresh and drilled weathered South African coal fly ashes |
title |
Geochemical fractionation of hazardous elements in fresh and drilled weathered South African coal fly ashes |
spellingShingle |
Geochemical fractionation of hazardous elements in fresh and drilled weathered South African coal fly ashes Weathered ash Fresh ash Organic petrography Sequential extraction Metal mobility Mineral transformations |
title_short |
Geochemical fractionation of hazardous elements in fresh and drilled weathered South African coal fly ashes |
title_full |
Geochemical fractionation of hazardous elements in fresh and drilled weathered South African coal fly ashes |
title_fullStr |
Geochemical fractionation of hazardous elements in fresh and drilled weathered South African coal fly ashes |
title_full_unstemmed |
Geochemical fractionation of hazardous elements in fresh and drilled weathered South African coal fly ashes |
title_sort |
Geochemical fractionation of hazardous elements in fresh and drilled weathered South African coal fly ashes |
dc.creator.fl_str_mv |
Akinyemi, S. A. Gitari, W. M. Thobakgale, R. Petrik, L. F. Nyakuma, B. B. Hower, J. C. Ward, C. R. Silva Oliveira, Marcos Leandro Silva Oliveira, Luis Felipe |
dc.contributor.author.spa.fl_str_mv |
Akinyemi, S. A. Gitari, W. M. Thobakgale, R. Petrik, L. F. Nyakuma, B. B. Hower, J. C. Ward, C. R. Silva Oliveira, Marcos Leandro Silva Oliveira, Luis Felipe |
dc.subject.spa.fl_str_mv |
Weathered ash Fresh ash Organic petrography Sequential extraction Metal mobility Mineral transformations |
topic |
Weathered ash Fresh ash Organic petrography Sequential extraction Metal mobility Mineral transformations |
description |
The chemical reactions of dry-disposed ash dump, ingressed oxygen, carbon dioxide, and infiltrating rainwater affect mineralogical transformation, redistribution, and migration of chemical species. Composite samples of weathered coal fly ash taken at various depths and fresh coal fly ash were examined using organic petrographic, X-ray diffraction, X-ray fluorescence techniques, and successive extraction procedures. Results obtained show relative enrichment of glass, Al–Fe-oxides, calcite, and tridymite in the weathered CFA, but the fresh CFA is enriched in mullite, inertinite, maghemite, and ettringite. The enrichment of the weathered CFA in amorphous glass suggests higher reactivity when compared to fresh CFA. The evident depletion of soluble oxides in the weathered CFA is attributed to flushing of the soluble salts by percolating rainwater. Comparative enrichment of examined elements in water-soluble, exchangeable, reducible, and residual fractions of the weathered CFA is partly due to the slow release of adsorbed chemical species from the alumina-silicate matrix and diffusion from the deeper sections of the particles of coal fly ash. Sodium and potassium show enrichment in the oxidisable fraction of fresh CFA. The estimated mobility factor indicates mobility for Ca, Mg, Na, Se, Mo, and Sb and K, Sr, V, Cu, Cr, Se, and B in fresh and weathered CFAs, respectively. |
publishDate |
2020 |
dc.date.accessioned.none.fl_str_mv |
2020-08-20T16:52:13Z |
dc.date.available.none.fl_str_mv |
2020-08-20T16:52:13Z |
dc.date.issued.none.fl_str_mv |
2020 |
dc.type.spa.fl_str_mv |
Artículo de revista |
dc.type.coar.fl_str_mv |
http://purl.org/coar/resource_type/c_2df8fbb1 |
dc.type.coar.spa.fl_str_mv |
http://purl.org/coar/resource_type/c_6501 |
dc.type.content.spa.fl_str_mv |
Text |
dc.type.driver.spa.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.redcol.spa.fl_str_mv |
http://purl.org/redcol/resource_type/ART |
dc.type.version.spa.fl_str_mv |
info:eu-repo/semantics/acceptedVersion |
format |
http://purl.org/coar/resource_type/c_6501 |
status_str |
acceptedVersion |
dc.identifier.uri.spa.fl_str_mv |
https://hdl.handle.net/11323/6938 |
dc.identifier.doi.spa.fl_str_mv |
https://doi.org/10.1007/s10653-019-00511-3 |
dc.identifier.instname.spa.fl_str_mv |
Corporación Universidad de la Costa |
dc.identifier.reponame.spa.fl_str_mv |
REDICUC - Repositorio CUC |
dc.identifier.repourl.spa.fl_str_mv |
https://repositorio.cuc.edu.co/ |
url |
https://hdl.handle.net/11323/6938 https://doi.org/10.1007/s10653-019-00511-3 https://repositorio.cuc.edu.co/ |
identifier_str_mv |
Corporación Universidad de la Costa REDICUC - Repositorio CUC |
dc.language.iso.none.fl_str_mv |
eng |
language |
eng |
dc.rights.spa.fl_str_mv |
CC0 1.0 Universal |
dc.rights.uri.spa.fl_str_mv |
http://creativecommons.org/publicdomain/zero/1.0/ |
dc.rights.accessrights.spa.fl_str_mv |
info:eu-repo/semantics/openAccess |
dc.rights.coar.spa.fl_str_mv |
http://purl.org/coar/access_right/c_abf2 |
rights_invalid_str_mv |
CC0 1.0 Universal http://creativecommons.org/publicdomain/zero/1.0/ http://purl.org/coar/access_right/c_abf2 |
eu_rights_str_mv |
openAccess |
dc.publisher.spa.fl_str_mv |
Corporación Universidad de la Costa |
dc.source.spa.fl_str_mv |
Environmental Geochemistry and Health |
institution |
Corporación Universidad de la Costa |
dc.source.url.spa.fl_str_mv |
https://link.springer.com/article/10.1007/s10653-019-00511-3 |
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spelling |
Akinyemi, S. A.Gitari, W. M.Thobakgale, R.Petrik, L. F.Nyakuma, B. B.Hower, J. C.Ward, C. R.Silva Oliveira, Marcos LeandroSilva Oliveira, Luis Felipe2020-08-20T16:52:13Z2020-08-20T16:52:13Z2020https://hdl.handle.net/11323/6938https://doi.org/10.1007/s10653-019-00511-3Corporación Universidad de la CostaREDICUC - Repositorio CUChttps://repositorio.cuc.edu.co/The chemical reactions of dry-disposed ash dump, ingressed oxygen, carbon dioxide, and infiltrating rainwater affect mineralogical transformation, redistribution, and migration of chemical species. Composite samples of weathered coal fly ash taken at various depths and fresh coal fly ash were examined using organic petrographic, X-ray diffraction, X-ray fluorescence techniques, and successive extraction procedures. Results obtained show relative enrichment of glass, Al–Fe-oxides, calcite, and tridymite in the weathered CFA, but the fresh CFA is enriched in mullite, inertinite, maghemite, and ettringite. The enrichment of the weathered CFA in amorphous glass suggests higher reactivity when compared to fresh CFA. The evident depletion of soluble oxides in the weathered CFA is attributed to flushing of the soluble salts by percolating rainwater. Comparative enrichment of examined elements in water-soluble, exchangeable, reducible, and residual fractions of the weathered CFA is partly due to the slow release of adsorbed chemical species from the alumina-silicate matrix and diffusion from the deeper sections of the particles of coal fly ash. Sodium and potassium show enrichment in the oxidisable fraction of fresh CFA. The estimated mobility factor indicates mobility for Ca, Mg, Na, Se, Mo, and Sb and K, Sr, V, Cu, Cr, Se, and B in fresh and weathered CFAs, respectively.Akinyemi, S. A.Gitari, W. M.Thobakgale, R.Petrik, L. F.Nyakuma, B. B.Hower, J. C.Ward, C. R.Silva Oliveira, Marcos LeandroSilva Oliveira, Luis FelipeengCorporación Universidad de la CostaCC0 1.0 Universalhttp://creativecommons.org/publicdomain/zero/1.0/info:eu-repo/semantics/openAccesshttp://purl.org/coar/access_right/c_abf2Environmental Geochemistry and Healthhttps://link.springer.com/article/10.1007/s10653-019-00511-3Weathered ashFresh ashOrganic petrographySequential extractionMetal mobilityMineral transformationsGeochemical fractionation of hazardous elements in fresh and drilled weathered South African coal fly ashesArtículo de revistahttp://purl.org/coar/resource_type/c_6501http://purl.org/coar/resource_type/c_2df8fbb1Textinfo:eu-repo/semantics/articlehttp://purl.org/redcol/resource_type/ARTinfo:eu-repo/semantics/acceptedVersionPublicationORIGINALGeochemical fractionation of hazardous elements in fresh and drilled weathered South African coal fly ashes.pdfGeochemical fractionation of hazardous elements in fresh and drilled weathered South African coal fly 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