Variable dual C-Cl isotope slopes of trichloromethane transformation by alkaline-activated persulfate under different simulated field conditions

Laboratory experiments were conducted to evaluate the potential of δ13C and δ37Cl isotopic values of trichloromethane (TCM) to monitor and quantify its transformation during alkaline persulfate (PS) activation. Batch experiments were designed to replicate different TCM:PS molar ratios, pH values, th...

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Autores: Gil-Villalba, Sergio, Rosell, Mònica, Torrentó Aguerri, Clara, Vinyes-Nadal, Martí, Soler i Gil, Albert, Palau, Jordi
Tipo de documento: artigo
Estado:Versão publicada
Data de publicação:2025
País:España
Recursos:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositório:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/227502
Acesso em linha:https://hdl.handle.net/2445/227502
Access Level:Acceso aberto
Palavra-chave:Cloroform
Contaminació de l'aigua
Geoquímica
Chloroform
Water pollution
Geochemistry
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spelling Variable dual C-Cl isotope slopes of trichloromethane transformation by alkaline-activated persulfate under different simulated field conditionsGil-Villalba, SergioRosell, MònicaTorrentó Aguerri, ClaraVinyes-Nadal, MartíSoler i Gil, AlbertPalau, JordiCloroformContaminació de l'aiguaGeoquímicaChloroformWater pollutionGeochemistryLaboratory experiments were conducted to evaluate the potential of δ13C and δ37Cl isotopic values of trichloromethane (TCM) to monitor and quantify its transformation during alkaline persulfate (PS) activation. Batch experiments were designed to replicate different TCM:PS molar ratios, pH values, the presence of CO32- ion and the simulation of an alkaline interception trench. Results revealed three distinct C-Cl isotopic trends; First, despite differences in degradation kinetics, isotopic trends were consistent across TCM:PS molar ratios (ΛC-Cl between 23 ± 10 and 33 ± 6), suggesting that radical activation remained unaffected. Conversely, at pH 12.8, alkaline hydrolysis (AH) became the predominant degradation process (ΛC-Cl of 9 ± 1 and 11 ± 1) over reaction with PS derived radical species. Finally, in the presence of excess CO32- ion, which acts as radical scavenger probably affecting the radical species involved in TCM degradation, a ΛC-Cl value of 5.5 ± 0.6 was observed, suggesting a reductive degradation reaction. Therefore, our results reveal, for the first time, that the dual C-Cl isotope slope during TCM degradation by PS varies significantly depending on field conditions. The unexpected accumulation of higher chlorinated byproducts, such as hexachloroethane, during TCM degradation by alkaline-activated PS was observed for the first time and further research is needed in real open-systems to assess its potential environmental implications.Elsevier B.V.2026202620252026info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion9 p.application/pdfhttps://hdl.handle.net/2445/227502Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció del document publicat a: https://doi.org/10.1016/j.jhazmat.2025.137702Journal of Hazardous Materials, 2025, vol. 489https://doi.org/10.1016/j.jhazmat.2025.137702cc-by (c) Gil-Villalba, Sergio et al.., 2025https://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:recercat.cat:2445/2275022026-05-29T05:05:01Z
dc.title.none.fl_str_mv Variable dual C-Cl isotope slopes of trichloromethane transformation by alkaline-activated persulfate under different simulated field conditions
title Variable dual C-Cl isotope slopes of trichloromethane transformation by alkaline-activated persulfate under different simulated field conditions
spellingShingle Variable dual C-Cl isotope slopes of trichloromethane transformation by alkaline-activated persulfate under different simulated field conditions
Gil-Villalba, Sergio
Cloroform
Contaminació de l'aigua
Geoquímica
Chloroform
Water pollution
Geochemistry
title_short Variable dual C-Cl isotope slopes of trichloromethane transformation by alkaline-activated persulfate under different simulated field conditions
title_full Variable dual C-Cl isotope slopes of trichloromethane transformation by alkaline-activated persulfate under different simulated field conditions
title_fullStr Variable dual C-Cl isotope slopes of trichloromethane transformation by alkaline-activated persulfate under different simulated field conditions
title_full_unstemmed Variable dual C-Cl isotope slopes of trichloromethane transformation by alkaline-activated persulfate under different simulated field conditions
title_sort Variable dual C-Cl isotope slopes of trichloromethane transformation by alkaline-activated persulfate under different simulated field conditions
dc.creator.none.fl_str_mv Gil-Villalba, Sergio
Rosell, Mònica
Torrentó Aguerri, Clara
Vinyes-Nadal, Martí
Soler i Gil, Albert
Palau, Jordi
author Gil-Villalba, Sergio
author_facet Gil-Villalba, Sergio
Rosell, Mònica
Torrentó Aguerri, Clara
Vinyes-Nadal, Martí
Soler i Gil, Albert
Palau, Jordi
author_role author
author2 Rosell, Mònica
Torrentó Aguerri, Clara
Vinyes-Nadal, Martí
Soler i Gil, Albert
Palau, Jordi
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Cloroform
Contaminació de l'aigua
Geoquímica
Chloroform
Water pollution
Geochemistry
topic Cloroform
Contaminació de l'aigua
Geoquímica
Chloroform
Water pollution
Geochemistry
description Laboratory experiments were conducted to evaluate the potential of δ13C and δ37Cl isotopic values of trichloromethane (TCM) to monitor and quantify its transformation during alkaline persulfate (PS) activation. Batch experiments were designed to replicate different TCM:PS molar ratios, pH values, the presence of CO32- ion and the simulation of an alkaline interception trench. Results revealed three distinct C-Cl isotopic trends; First, despite differences in degradation kinetics, isotopic trends were consistent across TCM:PS molar ratios (ΛC-Cl between 23 ± 10 and 33 ± 6), suggesting that radical activation remained unaffected. Conversely, at pH 12.8, alkaline hydrolysis (AH) became the predominant degradation process (ΛC-Cl of 9 ± 1 and 11 ± 1) over reaction with PS derived radical species. Finally, in the presence of excess CO32- ion, which acts as radical scavenger probably affecting the radical species involved in TCM degradation, a ΛC-Cl value of 5.5 ± 0.6 was observed, suggesting a reductive degradation reaction. Therefore, our results reveal, for the first time, that the dual C-Cl isotope slope during TCM degradation by PS varies significantly depending on field conditions. The unexpected accumulation of higher chlorinated byproducts, such as hexachloroethane, during TCM degradation by alkaline-activated PS was observed for the first time and further research is needed in real open-systems to assess its potential environmental implications.
publishDate 2025
dc.date.none.fl_str_mv 2025
2026
2026
2026
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/227502
url https://hdl.handle.net/2445/227502
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1016/j.jhazmat.2025.137702
Journal of Hazardous Materials, 2025, vol. 489
https://doi.org/10.1016/j.jhazmat.2025.137702
dc.rights.none.fl_str_mv cc-by (c) Gil-Villalba, Sergio et al.., 2025
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc-by (c) Gil-Villalba, Sergio et al.., 2025
https://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 9 p.
application/pdf
dc.publisher.none.fl_str_mv Elsevier B.V.
publisher.none.fl_str_mv Elsevier B.V.
dc.source.none.fl_str_mv Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812455

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