Microcalorimetric Investigation on the Kinetics of the Oxidation of Ascorbic Acid with Hydrogen Peroxide

• 来源期刊: 中国化学（英文版）
• 年，卷（期）: 2004,（6）
• 页码范围: 515-520
• 页数: 6页
• 语种: 英文

摘要

Based on the thermokinetic theory, a novel thermokinetic research method-self-function regression method,which could be used to determine the kinetic parameters k1, k2 and k 1 of the complex reaction:B+C(k1 k-1)Ik2→ P, was proposed in this paper. The kinetics of the reaction of ascorbic acid (H2A) with hydrogen peroxide was investigated at pH=5-7 and T=298.15 K, and the kinetic parameters k1, k 2 and k-1 were obtained with this method. The kinetics of the reaction was investigated in detail. The kinetic parameters of the oxidation of ascorbic monoanion (HA) and ascorbic dianion (A2-) with hydrogen peroxide were 3.33 × 10-3 s-1 and 25.48 s-1 at 298.15 K, respectively. The molar enthalpy change for the reaction was -554.64 kJ · mol-1 in phosphate buffer solution at pH 7 and at 298.15 K.