title: Micellar medium for the analysis of complex mixtures of molybdenum and tungsten by derivative synchronous spectrofluorimetry in steels.
abstract: The cationic surfactant hexadecyltrimethylammonium bromide enhances the fluorescence intensity of both molybdenum and tungsten complexes obtained with Alizarin Red S. This characteristic has been used for a sensitive simultaneous spectrofluorimetric determination of both ions over the range 32-4000 ng/ml and 49-2500 ng/ml for Mo and W, respectively. Good selectivity is achieved applying the well known synchronous derivative technique with a minucious pH selection. The proposed method has been applied to a certified steel sample with recoveries between 96 and 102%.
authors.affiliation: Department of Analytical Chemistry, Faculty of Sciences, University of Granada, 18071 Granada, Spain.
authors.forename: C C
authors.initials: CC
authors.lastname: Blanco
authors.forename: A M
authors.initials: AM
authors.lastname: Campaña
authors.forename: F A
authors.initials: FA
authors.lastname: Barrero
authors.forename: M R
authors.initials: MR
authors.lastname: Ceba