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Journal

2012 | 10 | 6 | 1942-1948

Article title

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

Content

Title variants

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

Publisher

Journal

Year

Volume

10

Issue

6

Pages

1942-1948

Physical description

Dates

published
1 - 12 - 2012
online
21 - 9 - 2012

Contributors

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

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Document Type

Publication order reference

Identifiers

YADDA identifier

bwmeta1.element.-psjd-doi-10_2478_s11532-012-0125-z
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