Gas phase molecular absorption spectrometry: determination of sulphide with diode- array detection
- Cabredo, S. 1
- Galbán, J. 2
- Sanz, J. 1
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1
Universidad de La Rioja
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2
Universidad de Zaragoza
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ISSN: 0026-3672
Datum der Publikation: 1997
Ausgabe: 127
Nummer: 3--4
Seiten: 239-242
Art: Artikel
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Zusammenfassung
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.