A revisit of the interaction of gaseous ozone with aqueous iodide. Estimating the contributions of the surface and bulk reactions

The main source of atmospheric iodine is the heterogeneous reaction of aqueous iodide (I‐ ) with ozone (O3), which takes place in surface seawater and probably in sea‐salt aerosols. However, there are seemingly contradictory conclusions about whether this heterogeneous reaction occurs in the bulk of...

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Autores: Moreno, Carolina, Gálvez González, Óscar, López-Arza Moreno, Vicente, Espíldora García, Eva María, Baeza Romero, María Teresa
Tipo de recurso: artículo
Fecha de publicación:2018
País:España
Institución:Universidad de Castilla-La Mancha
Repositorio:RUIdeRA. Repositorio Institucional de la UCLM
OAI Identifier:oai:ruidera.uclm.es:10578/29042
Acceso en línea:http://hdl.handle.net/10578/29042
Access Level:acceso abierto
Palabra clave:gaseous ozone
aqueous iodide
atmospheric iodine
ozone (O3)
surface seawater
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spelling A revisit of the interaction of gaseous ozone with aqueous iodide. Estimating the contributions of the surface and bulk reactionsMoreno, CarolinaGálvez González, ÓscarLópez-Arza Moreno, VicenteEspíldora García, Eva MaríaBaeza Romero, María Teresagaseous ozoneaqueous iodideatmospheric iodineozone (O3)surface seawaterThe main source of atmospheric iodine is the heterogeneous reaction of aqueous iodide (I‐ ) with ozone (O3), which takes place in surface seawater and probably in sea‐salt aerosols. However, there are seemingly contradictory conclusions about whether this heterogeneous reaction occurs in the bulk of the aqueous phase, via O3 dissolution, or at the aqueous surface, via O3 adsorption. In this work, the ozone uptake coefficient has been calculated as a function of the concentration of aqueous iodide ([I‐ ]aq) and gaseous ozone near the aqueous surface ([O3]gs) by estimating parameters of the resistor model using results of previous studies. The calculated uptake coefficients suggest that the aqueous‐phase reaction dominates at low I ‐ concentrations (about <10‐4 mol/L), regardless of [O3]gs, and also at sufficiently high [O3]gs (about >10 ppm), regardless of [I‐ ]aq. In contrast, the surface reaction dominates at high [I‐ ]aq (about >10‐4 mol/L) as long as [O3]gs is low enough (about <10 ppm). This trend is able to reconcile previous studies of this reaction, and is a consequence of several factors, including the high surface excess of both reactants ozone and iodide. Given the typical O3 concentrations in the troposphere and the possible I ‐ concentrations and O3 solubilities in sea‐salt aerosols, the surface reaction may compete with the aqueous phase reaction in sea‐salt aerosols, unlike in surface seawater, where the aqueous‐phase reaction prevails. The rate constant of the surface reaction has been estimated as (5‐500)10^‐13 cm2 molecule‐1 s‐1 .Royal Society of Chemistry202120212018info:eu-repo/semantics/articleapplication/pdfapplication/pdfhttp://hdl.handle.net/10578/29042reponame:RUIdeRA. Repositorio Institucional de la UCLMinstname:Universidad de Castilla-La ManchaInglésinfo:eu-repo/semantics/openAccessoai:ruidera.uclm.es:10578/290422026-05-27T07:36:41Z
dc.title.none.fl_str_mv A revisit of the interaction of gaseous ozone with aqueous iodide. Estimating the contributions of the surface and bulk reactions
title A revisit of the interaction of gaseous ozone with aqueous iodide. Estimating the contributions of the surface and bulk reactions
spellingShingle A revisit of the interaction of gaseous ozone with aqueous iodide. Estimating the contributions of the surface and bulk reactions
Moreno, Carolina
gaseous ozone
aqueous iodide
atmospheric iodine
ozone (O3)
surface seawater
title_short A revisit of the interaction of gaseous ozone with aqueous iodide. Estimating the contributions of the surface and bulk reactions
title_full A revisit of the interaction of gaseous ozone with aqueous iodide. Estimating the contributions of the surface and bulk reactions
title_fullStr A revisit of the interaction of gaseous ozone with aqueous iodide. Estimating the contributions of the surface and bulk reactions
title_full_unstemmed A revisit of the interaction of gaseous ozone with aqueous iodide. Estimating the contributions of the surface and bulk reactions
title_sort A revisit of the interaction of gaseous ozone with aqueous iodide. Estimating the contributions of the surface and bulk reactions
dc.creator.none.fl_str_mv Moreno, Carolina
Gálvez González, Óscar
López-Arza Moreno, Vicente
Espíldora García, Eva María
Baeza Romero, María Teresa
author Moreno, Carolina
author_facet Moreno, Carolina
Gálvez González, Óscar
López-Arza Moreno, Vicente
Espíldora García, Eva María
Baeza Romero, María Teresa
author_role author
author2 Gálvez González, Óscar
López-Arza Moreno, Vicente
Espíldora García, Eva María
Baeza Romero, María Teresa
author2_role author
author
author
author
dc.subject.none.fl_str_mv gaseous ozone
aqueous iodide
atmospheric iodine
ozone (O3)
surface seawater
topic gaseous ozone
aqueous iodide
atmospheric iodine
ozone (O3)
surface seawater
description The main source of atmospheric iodine is the heterogeneous reaction of aqueous iodide (I‐ ) with ozone (O3), which takes place in surface seawater and probably in sea‐salt aerosols. However, there are seemingly contradictory conclusions about whether this heterogeneous reaction occurs in the bulk of the aqueous phase, via O3 dissolution, or at the aqueous surface, via O3 adsorption. In this work, the ozone uptake coefficient has been calculated as a function of the concentration of aqueous iodide ([I‐ ]aq) and gaseous ozone near the aqueous surface ([O3]gs) by estimating parameters of the resistor model using results of previous studies. The calculated uptake coefficients suggest that the aqueous‐phase reaction dominates at low I ‐ concentrations (about <10‐4 mol/L), regardless of [O3]gs, and also at sufficiently high [O3]gs (about >10 ppm), regardless of [I‐ ]aq. In contrast, the surface reaction dominates at high [I‐ ]aq (about >10‐4 mol/L) as long as [O3]gs is low enough (about <10 ppm). This trend is able to reconcile previous studies of this reaction, and is a consequence of several factors, including the high surface excess of both reactants ozone and iodide. Given the typical O3 concentrations in the troposphere and the possible I ‐ concentrations and O3 solubilities in sea‐salt aerosols, the surface reaction may compete with the aqueous phase reaction in sea‐salt aerosols, unlike in surface seawater, where the aqueous‐phase reaction prevails. The rate constant of the surface reaction has been estimated as (5‐500)10^‐13 cm2 molecule‐1 s‐1 .
publishDate 2018
dc.date.none.fl_str_mv 2018
2021
2021
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10578/29042
url http://hdl.handle.net/10578/29042
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Royal Society of Chemistry
publisher.none.fl_str_mv Royal Society of Chemistry
dc.source.none.fl_str_mv reponame:RUIdeRA. Repositorio Institucional de la UCLM
instname:Universidad de Castilla-La Mancha
instname_str Universidad de Castilla-La Mancha
reponame_str RUIdeRA. Repositorio Institucional de la UCLM
collection RUIdeRA. Repositorio Institucional de la UCLM
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.300724

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