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dc.contributor.authorAllard, Sebastien
dc.contributor.authorGallard, H.
dc.date.accessioned2017-01-30T13:44:21Z
dc.date.available2017-01-30T13:44:21Z
dc.date.created2013-12-11T04:17:59Z
dc.date.issued2013
dc.identifier.citationAllard, Sebastien and Gallard, H. 2013. Abiotic formation of methyl iodide on synthetic birnessite: A mechanistic study. Science of the Total Environment. 463-464: pp. 169-175.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/34566
dc.identifier.doi10.1016/j.scitotenv.2013.05.079
dc.description.abstract

Methyl iodide is a well-known volatile halogenated organic compound that contributes to the iodine content in the troposphere, potentially resulting in damage to the ozone layer. Most methyl iodide sources derive from biological activity in oceans and soils with very few abiotic mechanisms proposed in the literature. In this study we report that synthetic manganese oxide (birnessite δ-MnO2) can catalyze the formation of methyl iodide in the presence of natural organic matter (NOM) and iodide. Methyl iodide formation was only observed at acidic pH (4–5) where iodide is oxidized to iodine and NOM is adsorbed on δ-MnO2. The effect of δ-MnO2, iodide and NOM concentrations, nature of NOM and ionic strength was investigated. High concentrations of methyl iodide were formed in experiments conducted with the model compound pyruvate. The Lewis acid property of δ-MnO2 leads to a polarization of the iodine molecule, and catalyzes the reaction with natural organic matter. As manganese oxides are strong oxidants and are ubiquitous in the environment, this mechanism could significantly contribute to the global atmospheric input of iodine.

dc.publisherElsevier
dc.subjectIodide
dc.subjectVolatile halogenated organic compound
dc.subjectNatural organic matter
dc.subjectAtmospheric iodine
dc.subjectIodine
dc.subjectManganese oxide
dc.titleAbiotic formation of methyl iodide on synthetic birnessite: A mechanistic study
dc.typeJournal Article
dcterms.source.volume463
dcterms.source.startPage169
dcterms.source.endPage175
dcterms.source.issn0048-9697
dcterms.source.titleScience of the Total Environment
curtin.note

NOTICE: this is the author’s version of a work that was accepted for publication in Science of the Total Environment. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Science of the Total Environment, Vol. 463-464 (2013). DOI: 10.1016/j.scitotenv.2013.05.079

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curtin.accessStatusOpen access


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