Controls on the surface chemical reactivity of volcanic ash investigated with probe gases
Increasing recognition that volcanic ash emissions can have significant impacts on the natural and human environment calls for a better understanding of ash chemical reactivity as mediated by its surface characteristics. However, previous studies of ash surface properties have relied on techniques t...
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ftunistlouisbrus:oai:dial.uclouvain.be:boreal:176340 2023-05-15T16:09:39+02:00 Controls on the surface chemical reactivity of volcanic ash investigated with probe gases Maters, Elena Delmelle, Pierre Rossi, Michel J. Ayris, Paul Bernard, Alain UCL - SST/ELI/ELIE - Environmental Sciences 2016 http://hdl.handle.net/2078.1/176340 https://doi.org/10.1016/j.epsl.2016;06.044 eng eng Elsevier BV boreal:176340 http://hdl.handle.net/2078.1/176340 doi:10.1016/j.epsl.2016;06.044 urn:ISSN:0012-821X urn:EISSN:1385-013X info:eu-repo/semantics/restrictedAccess Earth and Planetary Science Letters, , no.450, p. 254-262 (2016) volcanic ash ash surface chemical reactivity eruption plume 1435 1413 info:eu-repo/semantics/article 2016 ftunistlouisbrus https://doi.org/10.1016/j.epsl.2016;06.044 2019-03-20T23:17:04Z Increasing recognition that volcanic ash emissions can have significant impacts on the natural and human environment calls for a better understanding of ash chemical reactivity as mediated by its surface characteristics. However, previous studies of ash surface properties have relied on techniques that lack the sensitivity required to adequately investigate them. Here we characterise at the molecular monolayer scale the surfaces of ash erupted from Eyjafjallajökull, Tungurahua, Pinatubo and Chaitén volcanoes. Interrogation of the ash with four probe gases,trimethylamine (TMA; N(CH3)3), trifluoroacetic acid (TFA; CF3COOH), hydroxylamine (HA; NH2OH) and ozone (O3), reveals the abundances of acid–base and redox sites on ash surfaces. Measurements on aluminosilicate glass powders, as compositional proxies for the primary constituent of volcanic ash, are also conducted. We attribute the greater proportion of acidic and oxidised sites on ash relative to glass surfaces, evidenced by comparison of TMA/TFA and HA/O3uptake ratios, in part to ash interaction with volcanic gases and condensates (e.g., H2O, SO2, H2SO4, HCl, HF) during the eruption. The strong influence of ash surface processing in the eruption plume and/or cloud is further supported by particular abundances of oxidised and reduced sites on the ash samples resulting from specific characteristics of their eruptions of origin. Intense interaction with water vapour may result in a higher fraction of oxidised sites on ash produced by phreatomagmatic than by magmatic activity. This study constitutes the first quantification of ash chemical properties at the molecular monolayer scale, and is an important step towards better understanding the factors that govern the role of ash as a chemical agent within atmospheric, terrestrial, aquatic or biotic systems. Article in Journal/Newspaper Eyjafjallajökull DIAL@USL-B (Université Saint-Louis, Bruxelles) |
institution |
Open Polar |
collection |
DIAL@USL-B (Université Saint-Louis, Bruxelles) |
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ftunistlouisbrus |
language |
English |
topic |
volcanic ash ash surface chemical reactivity eruption plume 1435 1413 |
spellingShingle |
volcanic ash ash surface chemical reactivity eruption plume 1435 1413 Maters, Elena Delmelle, Pierre Rossi, Michel J. Ayris, Paul Bernard, Alain Controls on the surface chemical reactivity of volcanic ash investigated with probe gases |
topic_facet |
volcanic ash ash surface chemical reactivity eruption plume 1435 1413 |
description |
Increasing recognition that volcanic ash emissions can have significant impacts on the natural and human environment calls for a better understanding of ash chemical reactivity as mediated by its surface characteristics. However, previous studies of ash surface properties have relied on techniques that lack the sensitivity required to adequately investigate them. Here we characterise at the molecular monolayer scale the surfaces of ash erupted from Eyjafjallajökull, Tungurahua, Pinatubo and Chaitén volcanoes. Interrogation of the ash with four probe gases,trimethylamine (TMA; N(CH3)3), trifluoroacetic acid (TFA; CF3COOH), hydroxylamine (HA; NH2OH) and ozone (O3), reveals the abundances of acid–base and redox sites on ash surfaces. Measurements on aluminosilicate glass powders, as compositional proxies for the primary constituent of volcanic ash, are also conducted. We attribute the greater proportion of acidic and oxidised sites on ash relative to glass surfaces, evidenced by comparison of TMA/TFA and HA/O3uptake ratios, in part to ash interaction with volcanic gases and condensates (e.g., H2O, SO2, H2SO4, HCl, HF) during the eruption. The strong influence of ash surface processing in the eruption plume and/or cloud is further supported by particular abundances of oxidised and reduced sites on the ash samples resulting from specific characteristics of their eruptions of origin. Intense interaction with water vapour may result in a higher fraction of oxidised sites on ash produced by phreatomagmatic than by magmatic activity. This study constitutes the first quantification of ash chemical properties at the molecular monolayer scale, and is an important step towards better understanding the factors that govern the role of ash as a chemical agent within atmospheric, terrestrial, aquatic or biotic systems. |
author2 |
UCL - SST/ELI/ELIE - Environmental Sciences |
format |
Article in Journal/Newspaper |
author |
Maters, Elena Delmelle, Pierre Rossi, Michel J. Ayris, Paul Bernard, Alain |
author_facet |
Maters, Elena Delmelle, Pierre Rossi, Michel J. Ayris, Paul Bernard, Alain |
author_sort |
Maters, Elena |
title |
Controls on the surface chemical reactivity of volcanic ash investigated with probe gases |
title_short |
Controls on the surface chemical reactivity of volcanic ash investigated with probe gases |
title_full |
Controls on the surface chemical reactivity of volcanic ash investigated with probe gases |
title_fullStr |
Controls on the surface chemical reactivity of volcanic ash investigated with probe gases |
title_full_unstemmed |
Controls on the surface chemical reactivity of volcanic ash investigated with probe gases |
title_sort |
controls on the surface chemical reactivity of volcanic ash investigated with probe gases |
publisher |
Elsevier BV |
publishDate |
2016 |
url |
http://hdl.handle.net/2078.1/176340 https://doi.org/10.1016/j.epsl.2016;06.044 |
genre |
Eyjafjallajökull |
genre_facet |
Eyjafjallajökull |
op_source |
Earth and Planetary Science Letters, , no.450, p. 254-262 (2016) |
op_relation |
boreal:176340 http://hdl.handle.net/2078.1/176340 doi:10.1016/j.epsl.2016;06.044 urn:ISSN:0012-821X urn:EISSN:1385-013X |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.epsl.2016;06.044 |
_version_ |
1766405499400486912 |