Amb motiu del tancament d'estiu, la validació de documents es reprendrà a partir del 28 d'agost de 2026. Disculpeu les molèsties.
Con motivo del cierre de verano, la validación de documentos se reanudará a partir del 28 de agosto de 2026. Disculpad las molestias
Due to the summer closure, document validation will resume starting August 28, 2026. We apologize for any inconvenience.

Fitxers

678734.pdf (1.2 MB)

Tipus de document

Article

Versió

Versió acceptada

Data de publicació

2014-11-07

Tots els drets reservats

Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/163717

Carbon and chlorine isotope analysis to identify abiotic degradation pathways of 1,1,1-trichloroethane

Títol de la revista

Autors

Director/Tutor

ISSN de la revista

Títol del volum

Recurs relacionat

https://doi.org/10.1021/es504252z

Resum

This study investigates dual C-Cl isotope fractionation during 1,1,1-TCA transformation by heat-activated persulfate (PS), hydrolysis/dehydrohalogenation (HY/DH) and Fe(0). Compound-specific chlorine isotope analysis of 1,1,1-TCA was performed for the first time, and transformation-associated isotope fractionation ε_bulk^C and ε_bulk^Cl were: -4.0±0.2¿ and no chlorine isotope fractionation with PS, -1.6±0.2¿ and -4.7±0.1¿ for HY/DH, -7.8±0.4¿ and -5.2±0.2¿ with Fe(0). Distinctly different dual isotope slopes (Δδ13C/Δδ37Cl): ∞ with PS, 0.33±0.04 for HY/DH and 1.5±0.1 with Fe(0) highlight the potential of this approach to identify abiotic degradation pathways of 1,1,1-TCA in the field. The trend observed with PS agreed with a C-H bond oxidation mechanism in the first reaction step. For HY/DH and Fe(0) pathways, different slopes were obtained although both pathways involve cleavage of a C-Cl bond in their initial reaction step. In contrast to the expected larger primary carbon isotope effects relative to chlorine for C-Cl bond cleavage, ε_bulk^C<ε_bulk^Cl was observed for HY/DH and in a similar range for reduction by Fe(0), suggesting the contribution of secondary chlorine isotope effects. Therefore, different magnitude of secondary chlorine isotope effects could at least be partly responsible for the distinct slopes between HY/DH and Fe(0) pathways. Following this dual isotope approach abiotic transformation processes can unambiguously be identified and quantified.

Matèries

Isòtops de carboni, Clor

Matèries (anglès)

Carbon isotopes, Chlorine

Citació

Col·leccions

Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)

Citació

PALAU, Jordi, SHOUAKAR-STASH, O. and HUNKELER, D. Carbon and chlorine isotope analysis to identify abiotic degradation pathways of 1,1,1-trichloroethane. Environmental Science & Technology. 2014. Vol. 48, num. 24, pags. 14400-14408. ISSN 0013-936X. [consulted: 3 of August of 2026]. Available at: https://hdl.handle.net/2445/163717

Exportar metadades

JSON - METS

Compartir registre