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Reductive Defluorination of Perfluorooctane Sulfonate

Ochoa-Herrera, Valeria, Sierra-Alvarez, Reyes, Somogyi, Arpad, Jacobsen, Neil E., Wysocki, Vicki H., Field, Jim A.·2008·Environmental Science & Technology
DOI 10.1021/es702842q
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Abstract

Perfluorooctane sulfonate (PFOS) is under increased scrutiny as an environmental pollutant due to recent reports of its worldwide distribution, environmental persistence, and bioaccumulation potential. The susceptibility of technical PFOS and PFOS branched isomers to chemical reductive dehalogenation with vitamin B12 (260 microM) as catalyst and Ti(III)-citrate (36 mM) as bulk reductant in anoxic aqueous solution at 70 degrees C and pH 9 was evaluated in this study. Defluorination was confirmed by fluoride release measurements of 18% in technical PFOS, equivalent to the removal 3 mol F-/mol PFOS, and 71% in PFOS branched isomers equivalent to the removal of 12 mol F-/mol PFOS. Degradation of PFOS was further confirmed by monitoring the disappearance of PFOS compounds with reaction time by suppressed conductivity ion chromatography, LC-MS/MS, and 19F NMR studies. The PFOS compounds differed in their susceptibility to reductive degradation by vitamin B12Ti(III) citrate. Chromatographic peaks corresponding to branched PFOS isomers disappeared whereas the peak corresponding to linear PFOS was stable. To our knowledge this is the first report of reductive dehalogenation of PFOS catalyzed by a biomolecule.

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Metadata

Authors
Ochoa-Herrera, V., Sierra-Alvarez, R., Somogyi, A., Jacobsen, N. E., Wysocki, V. H., & Field, J. A.
Affiliations
Department of Chemical and Environmental Engineering and Department of Chemistry, University of Arizona, Tucson, Arizona 85721
Venue
Environmental Science & Technology
Publisher
American Chemical Society (ACS)
Published
2008-03-28
Volume
42
Issue
9
Pages
3260-3264
ISSN
  • 0013-936X
  • 1520-5851
DOI
10.1021/es702842q
Cited by
131
References
3
Language
en

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