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

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  • TAO Hiroaki
    Research Institute for Environmental Management Technology, National Institute of Advanced Industrial Science and Technology
  • NAKAZATO Tetsuya
    Research Institute for Environmental Management Technology, 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
  • SUZUKI Toshihiro
    National Research Council Canada, Measurement Science and Standards Portfolio National Metrology Institute of Japan, 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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