Computer method for the simultaneous kinetic determination of compounds in mixtures based on the use of diode-array spectrophotometry

A computer method for the treatment of kinetic data provided by a diode-array spectrophotometer was developed. The method relies on a non-linear regression procedure for estimating the rate constants and concentrations of mixture components. The underlying principle of this method is fitting the abs...

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Bibliographic Details
Published in:Analytica chimica acta 1993-02, Vol.272 (2), p.339-344
Main Authors: Cladera, Andreu, Gómez, Enrique, Estela, José Manuel, Cerdà, Víctor, Cerdà, Juan Luis
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Cobalt
Computer fitting
Exact sciences and technology
Kinetic methods: UV-Visible spectrophotometry
Nickel
Spectrometric and optical methods
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Summary:A computer method for the treatment of kinetic data provided by a diode-array spectrophotometer was developed. The method relies on a non-linear regression procedure for estimating the rate constants and concentrations of mixture components. The underlying principle of this method is fitting the absorption matrix obtained as a function of time and wavelength to a theoretical kinetic equation. This allows the resolution of mixtures of compounds with similar rate constants in a simultaneous fashion provided that they or their reaction products feature appreciable spectral differences from one another. The proposed method was applied to the resolution of Co(II) (0.1–1.0 μg ml −1)-Ni(II) (0.5–5.0 μg ml −1) mixtures based on displacement from their the EGTA complexes by 4-(2′-pyridylazo)resorcinol.
ISSN:0003-2670
1873-4324
DOI:10.1016/0003-2670(93)80586-A