Temperature and pH effects on the kinetics of 2-aminophenol auto-oxidation in aqueous solution |
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Authors: | Dumitru Oancea Mihaela Puiu |
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Affiliation: | (1) Department of Physical Chemistry, University of Bucharest, 4-12 bd. Elisabeta, sector 3, 70346 Bucharest, Romania |
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Abstract: | The kinetics of the auto-oxidation of 2-aminophenol (OAP) to 2-amino-phenoxazin-3-one (APX) was followed in air-saturated aqueous solutions and the influence of temperature and pH on the auto-oxidation rate was studied. The kinetic analysis was based on a spectrophotometric method following the increase of the absorbance of APX. The process follows first order kinetics according to the rate law—d[OAP]/dt=k′[OAP]. The experimental data, within the pH range 4–9.85, were analyzed using both differential and incremental methods. The temperature variation of the overall rate constant was studied at pH=9.85 within the range 25–50°C and the corresponding activation energy was evaluated. |
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Keywords: | auto-oxidation aminophenol phenoxazinone |
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