title: Gas generation and preconcentration coupled to gas phase molecular absorption spectrometry: a powerful tool for the simultaneous determination of analytes forming volatile compounds.
abstract: Different methods for a simultaneous determination of several analytes forming volatile compounds at room temperature are described. The main steps of these methods are: continuous generation, collection in a cryogenic trap, revolatilization, measurement of the volatile compounds by Gas Phase Molecular Absorption Spectrometry and resolution by multi-wavelength methods. Several mixtures containing 2, 3 or 4 components have been studied: 1) elements forming covalent hydrides; 2) arsenic organometallic compounds forming volatile gases with a similar structure to arsine; and 3) sulphur species that can evolve volatile compounds. Under the optimum conditions obtained for each mixture, detection limits range from 0.8 ng/mL (dimethylarsinic acid) to 2 microg/mL (SCN(-)).
authors.affiliation: Department of Analytical Chemistry, Faculty of Sciences, University of Zaragoza, E-50009, Zaragoza, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Galban
authors.forename: S
authors.initials: S
authors.lastname: Cabredo
authors.forename: F
authors.initials: F
authors.lastname: Gallarta
authors.forename: I
authors.initials: I
authors.lastname: Sanz
authors.forename: M
authors.initials: M
authors.lastname: Perez
authors.forename: J
authors.initials: J
authors.lastname: Sanz