Determination of thiocyanate by carbonyl sulphide (OCS)generation and gas-phase molecular absorption spectrometry.
- Cabredo Pinillos, S. 1
- Sanz Vicente, I. 1
- Galbán Bernal, J. 2
- Sanz Asensio, J. 1
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1
Universidad de La Rioja
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2
Universidad de Zaragoza
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ISSN: 0003-2670
Year of publication: 1996
Volume: 318
Issue: 3
Pages: 377-383
Type: Article
More publications in: Analytica Chimica Acta
Abstract
A method for determination of thiocyanate by gas-phase molecular absorption spectrometry is described. The proposed method is based on the continuous generation of carbonyl sulphide and preconcentration in a liquid nitrogen trap. Later, the product is volatilised and the absorbance at 224 nm is measured. Under the optimised conditions, the calibration graph was linear for 2-80 μg ml-1, with a detection limit of 1 μg ml-1. No metal ions interfered. The method was tested with saliva samples from non smokers and smokers; the results show that it is possible to distinguish between these two categories of individuals.