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  1. 1 Open Chemistry

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  1. 1 2003

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  1. 1 Oancea D.

  2. 1 Puiu M.

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Temperature and pH effects on the kinetics of 2-aminophenol auto-oxidation in aqueous solution

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Oancea D., Puiu M.
Open Chemistry
|
2003
|
vol. 1
|
issue 3
233-241
EN
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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