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...
Main Authors: | , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2016
|
Subjects: | |
Online Access: | http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/236707 https://dipot.ulb.ac.be/dspace/bitstream/2013/236707/1/Elsevier_220334.pdf |
id |
ftunivbruxelles:oai:dipot.ulb.ac.be:2013/236707 |
---|---|
record_format |
openpolar |
spelling |
ftunivbruxelles:oai:dipot.ulb.ac.be:2013/236707 2023-05-15T16:09:40+02:00 Controls on the surface chemical reactivity of volcanic ash investigated with probe gases Maters, Elena C Delmelle, Pierre Rossignol, Michel Ayris, Paul Martin Bernard, Alain 2016-09 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/236707 https://dipot.ulb.ac.be/dspace/bitstream/2013/236707/1/Elsevier_220334.pdf en eng uri/info:doi/10.1016/j.epsl.2016.06.044 uri/info:pii/S0012821X16303314 uri/info:scp/84979073976 https://dipot.ulb.ac.be/dspace/bitstream/2013/236707/1/Elsevier_220334.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/236707 1 full-text file(s): info:eu-repo/semantics/restrictedAccess Earth and planetary science letters, 450 Sciences de l'espace Géographie physique Pétrologie Géochimie Sciences de la terre et du cosmos ash surface chemical reactivity eruption plume volcanic ash info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2016 ftunivbruxelles 2022-06-12T21:35:46Z 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/O3 uptake 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. SCOPUS: ar.j info:eu-repo/semantics/published Article in Journal/Newspaper Eyjafjallajökull DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Sciences de l'espace Géographie physique Pétrologie Géochimie Sciences de la terre et du cosmos ash surface chemical reactivity eruption plume volcanic ash |
spellingShingle |
Sciences de l'espace Géographie physique Pétrologie Géochimie Sciences de la terre et du cosmos ash surface chemical reactivity eruption plume volcanic ash Maters, Elena C Delmelle, Pierre Rossignol, Michel Ayris, Paul Martin Bernard, Alain Controls on the surface chemical reactivity of volcanic ash investigated with probe gases |
topic_facet |
Sciences de l'espace Géographie physique Pétrologie Géochimie Sciences de la terre et du cosmos ash surface chemical reactivity eruption plume volcanic ash |
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/O3 uptake 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. SCOPUS: ar.j info:eu-repo/semantics/published |
format |
Article in Journal/Newspaper |
author |
Maters, Elena C Delmelle, Pierre Rossignol, Michel Ayris, Paul Martin Bernard, Alain |
author_facet |
Maters, Elena C Delmelle, Pierre Rossignol, Michel Ayris, Paul Martin Bernard, Alain |
author_sort |
Maters, Elena C |
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 |
publishDate |
2016 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/236707 https://dipot.ulb.ac.be/dspace/bitstream/2013/236707/1/Elsevier_220334.pdf |
genre |
Eyjafjallajökull |
genre_facet |
Eyjafjallajökull |
op_source |
Earth and planetary science letters, 450 |
op_relation |
uri/info:doi/10.1016/j.epsl.2016.06.044 uri/info:pii/S0012821X16303314 uri/info:scp/84979073976 https://dipot.ulb.ac.be/dspace/bitstream/2013/236707/1/Elsevier_220334.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/236707 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/restrictedAccess |
_version_ |
1766405517050118144 |