Influence of Speciation on the Response from Selenium to UV-Photochemical Vapor Generation

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  • SUZUKI Toshihiro
    National Research Council Canada, Measurement Science and Standards Portfolio National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology
  • STURGEON Ralph E.
    National Research Council Canada, Measurement Science and Standards Portfolio
  • ZHENG Chengbin
    College of Chemistry, Sichuan University
  • HIOKI Akiharu
    National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology
  • NAKAZATO Tetsuya
    Research Institute for Environmental Management Technology, National Institute of Advanced Industrial Science and Technology
  • TAO Hiroaki
    Research Institute for Environmental Management Technology, National Institute of Advanced Industrial Science and Technology

Bibliographic Information

Published
2012
Resource Type
journal article
DOI
  • 10.2116/analsci.28.807
Publisher
The Japan Society for Analytical Chemistry

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Description

By exposure to appropriate UV intensities, rapid and quantitative oxidation/reduction of inorganic selenite, selenate and several organoselenium compounds representative of those of biochemical/metabolic interest, including selenomethionine, selenobetaine, L-selenocystine, selenomethylselenocysteine, γ-glutamyl-seleno-methylselenocysteine and selenocystamine, is achieved. In the presence of acetic acid, quantitative conversion to volatile SeH2 and SeCO occurs using a flow-through system comprising a highly efficient 40 W UV lamp for oxidation in tandem with a lower power 8 W UV photocatalytic reactor utilizing a thin-film coating of titania. The volatile reduced species are detected by atomic absorption spectrometry using a heated quartz tube atomizer. Direct photochemical conversion of selenite, selenomethionine, L-selenocystine, γ-glutamyl-Se-methylselenocysteine and selenocystamine occurs in the presence of 5% acetic acid, following exposure to an 8 W UV field, to yield volatile detectable species, whereas selenobetaine and selenate are unresponsive unless the latter is first subjected to oxidation by exposure to a highly efficient 40 W UV lamp and the selenate reduced in the presence of titania.

Journal

  • Analytical Sciences

    Analytical Sciences 28 (8), 807-811, 2012

    The Japan Society for Analytical Chemistry

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