An accurate model for the determination of the kinetic coefficients of the copper-catalyzed oxidation of iodide by oxygen in an aqueous acidic medium
| Autor: | Marc Elskens, Fjo De Ridder, Anouk de Brauwere, Willy Baeyens |
|---|---|
| Přispěvatelé: | Analytical and Environmental Chemistry, Chemistry |
| Rok vydání: | 2009 |
| Předmět: |
chemistry.chemical_classification
Aqueous solution Iodide Analytical chemistry Reproducibility of Results Water chemistry.chemical_element Rate equation Hydrogen-Ion Concentration Iodides Kinetic energy Copper Oxygen Catalysis Analytical Chemistry Reaction rate Kinetics Models Chemical chemistry Acids Oxidation-Reduction Algorithms |
| Zdroj: | Vrije Universiteit Brussel |
| ISSN: | 0039-9140 |
| DOI: | 10.1016/j.talanta.2009.08.030 |
| Popis: | The reaction rate of the copper-catalyzed oxidation of iodide by oxygen in an aqueous acidic medium is first order in copper and oxygen concentrations, Michaelis-Menten in pH and a complex, asymmetrical bell shaped function in iodide concentrations. A theoretical, multivariate reaction rate equation was proposed which enabled to optimise the various kinetic coefficients. During the parameter optimisation, the experiments were weighted taking into account all measurement uncertainties, i.e. both on the reaction rate (output) and on the reactants' concentrations (inputs). This has two important advantages: (1) the model can be statistically checked to be acceptable for the description of the available measurements, and (2) the parameter uncertainties can be estimated accurately. In this case study, the model was indeed validated to be acceptable and the kinetic parameters could be estimated with a standard deviation between 5% (minimum) and 16% (maximum). As an application of this model, copper concentrations can be determined. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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