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Gas-phase molecular absorption spectrometry: Determination of sulphite with diode-array detection

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Abstract

A method is described for determining sulphite by SO2 generation and UV-visible molecular absorption spectrometry with diode-array detection. The molecular absorption maximum of SO2 appears at 198 nm. The parameters affecting generation (particularly those relating to the kinetics of the process) and determination are optimized; under the optimum conditions found, only a 30 s preconcentration time is necessary. The linear response range is between 10 and 1000 μg ml−1 of SO 2−3 , the RSD is 3.5% and the detection limit is 3.2 μg ml−1. The effect of different species on the SO2 signal is also studied. The method is applied to the determination of SO2 in air samples.

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Authors and Affiliations

  1. Chemistry Department, Analytical Chemistry Section, University of La Rioja, 26001, Logroño, Spain

    Susana Cabredo & Jesús Sanz

  2. Analytical Chemistry Department, Faculty of Sciences, University of Zaragoza, 50009, Zaragoza, Spain

    Javier Galbán

Authors
  1. Susana Cabredo
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  2. Javier Galbán
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  3. Jesús Sanz
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Cabredo, S., Galbán, J. & Sanz, J. Gas-phase molecular absorption spectrometry: Determination of sulphite with diode-array detection. Mikrochim Acta 127, 239–242 (1997). https://doi.org/10.1007/BF01242729

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  • DOI: https://doi.org/10.1007/BF01242729

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