Gas phase molecular absorption spectrometry: determination of sulphide with diode- array detection

  1. Cabredo, S. 1
  2. Galbán, J. 2
  3. Sanz, J. 1
  1. 1 Universidad de La Rioja
    info

    Universidad de La Rioja

    Logroño, España

    ROR https://ror.org/0553yr311

  2. 2 Universidad de Zaragoza
    info

    Universidad de Zaragoza

    Zaragoza, España

    ROR https://ror.org/012a91z28

Revista:
Mikrochimica acta

ISSN: 0026-3672

Any de publicació: 1997

Volum: 127

Número: 3--4

Pàgines: 239-242

Tipus: Article

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DOI: 10.1007/BF01242729 SCOPUS: 2-s2.0-0004977350 WoS: WOS:A1997XX83400012 GOOGLE SCHOLAR

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Resum

A method is described for determining sulphite by SO 2 generation and UV-visible molecular absorption spectrometry with diode-array detection. The molecular absorption maximum of SO 2 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 SO 2 signal is also studied. The method is applied to the determination of SO 2 in air samples.