Microcalorimetric investigation on the kinetics of the oxidation of ascorbic acid with hydrogen peroxide

作者：Meng XG^*; Kou XM; Xie JQ; Du J; Zeng XC

来源：Chinese Journal of Chemistry, 2004, 22(6): 515-520.

• ascorbic acid
• thermokinetics
• self-function regression method
• complex reaction
• reversible-consecutive first-order reaction

Based on the thermokinetic theory, a novel thermokinetic research method-self-function regression method, which could be used to determine the kinetic parameters k(1), k(2) and k(-1) of the complex reaction: B+ C (?)(k1)reversible arrow(k-1) I -->(k2) P, was proposed in this paper. The kinetics of the reaction of ascorbic acid (H(2)A) with hydrogen peroxidewas investigated at pH-5-7 and T-298.15 K, and the kinetic parameters k(1), 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 (A(2-)) with hydrogen peroxide were 3.33 x 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.

• 出版日期2004-6
• 单位四川大学