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

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Abstract

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.

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Authors and Affiliations

  1. National Research Council Canada, Measurement Science and Standards Portfolio, Montreal Road, Ottawa, K1A0R9, Canada

    Toshihiro Suzuki & Ralph E. Sturgeon

  2. National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki, 305-8563, Japan

    Toshihiro Suzuki & Akiharu Hioki

  3. College of Chemistry, Sichuan University, Chengdu, Sichuan, 610064, P. R. China

    Chengbin Zheng

  4. Research Institute for Environmental Management Technology, National Institute of Advanced Industrial Science and Technology, 16-1 Onogawa, Tsukuba, Ibaraki, 305-8569, Japan

    Tetsuya Nakazato & Hiroaki Tao

Authors
  1. Toshihiro Suzuki
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  2. Ralph E. Sturgeon
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  3. Chengbin Zheng
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  4. Akiharu Hioki
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  5. Tetsuya Nakazato
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  6. Hiroaki Tao
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Correspondence to Toshihiro Suzuki.

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Suzuki, T., Sturgeon, R.E., Zheng, C. et al. Influence of Speciation on the Response from Selenium to UV-Photochemical Vapor Generation. ANAL. SCI. 28, 807–811 (2012). https://doi.org/10.2116/analsci.28.807

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  • DOI: https://doi.org/10.2116/analsci.28.807

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