TY - JOUR
T1 - Reductive defluorination of perfluorooctane sulfonate
AU - Ochoa-Herrera, Valeria
AU - Sierra-Alvarez, Reyes
AU - Somogyi, Arpad
AU - Jacobsen, Neil E.
AU - Wysocki, Vicki H.
AU - Field, Jim A.
PY - 2008/5/1
Y1 - 2008/5/1
N2 - 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 B 12 (260 μ.M) as catalyst and Ti(lll)-citrate (36 mM) as bulk reductant in anoxic aqueous solution at 70 °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 B 12/Ti(lll) 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.
AB - 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 B 12 (260 μ.M) as catalyst and Ti(lll)-citrate (36 mM) as bulk reductant in anoxic aqueous solution at 70 °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 B 12/Ti(lll) 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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U2 - 10.1021/es702842q
DO - 10.1021/es702842q
M3 - Article
C2 - 18522103
AN - SCOPUS:50649102317
SN - 0013-936X
VL - 42
SP - 3260
EP - 3264
JO - Environmental Science and Technology
JF - Environmental Science and Technology
IS - 9
ER -