Application of multivariate curve resolution-alternating least squares (MCR-ALS) for resolving pyrogallol autoxidation in weakly alkaline aqueous solutions

• Authors: Aleksandar Veselinović , Ružica Nikolić , Goran Nikolić
• Languages of publication: EN

Abstracts

EN

Multivariate curve resolution - alternating least squares (MCR-ALS) has been applied to data collected from UV/Vis spectrophotometric analysis of the autoxidation process of pyrogallol in weakly alkaline aqueous solutions. The MCR-ALS analysis was able to explain the autoxidation kinetics of pyrogallol at pH 7.4 and 8.0, allowing deduction of the pure spectra and concentration changes of different species present throughout the entire process. The autoxidation process at pH 7.4 was found to follow a first-order reaction model, with formation of purpurogallin as the sole and terminal product. Changing the pH to 8.0 not only accelerated autoxidation of pyrogallol to purpurogallin but also introduced a further autoxidation of purpurogallin. At pH 8.0 the process fits a model of two consecutive first-order reactions. The first step is formation of purpurogallin, which reacts in a further autoxidation to form a yellow colored substance, most probably purpurogallin polymer. [...]

Keywords

EN

Pyrogallol; Purpurogallin; Autoxidation; MCR-ALS

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2012
• Volume: 10
• Issue: 6
• Pages: 1942-1948

Dates

published

1 - 12 - 2012

online

21 - 9 - 2012

Contributors

author

Aleksandar Veselinović

• Department of Chemistry, Faculty of Medicine, University of Niš, 18000, Niš, Serbia

author

Ružica Nikolić

• Department of Chemistry, Faculty of Sciences and Mathematics, University of Niš, 18000, Niš, Serbia

author

Goran Nikolić

• Department of Chemistry, Faculty of Medicine, University of Niš, 18000, Niš, Serbia

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Identifiers

DOI

10.2478/s11532-012-0125-z