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

作　　者：孟祥光 寇兴明 谢家庆 杜娟 曾宪诚 

机构地区：[1]Department of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China

出　　处：《Chinese Journal of Chemistry》2004年第6期515-520,共6页中国化学（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Nos. 20107004 & 20173038).

摘　　要：Based on the thermokinetic theory, a novel thermokinetic research methodself-function regression method, which could be used to determine the kinetic parameters k1, k2 and k-1 of the complex reaction: B+ , ,was proposed in this paper. The kinetics of the reaction of ascorbic acid (H2A) with hydrogen peroxide was investigated at pH=57 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-1and 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.Based on the thermokinetic theory, a novel thermokinetic research methodself-function regression method, which could be used to determine the kinetic parameters k1, k2 and k-1 of the complex reaction: B+ , ,was proposed in this paper. The kinetics of the reaction of ascorbic acid (H2A) with hydrogen peroxide was investigated at pH=57 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-1and 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.

关 键 词：ascorbic acid THERMOKINETICS self-function regression method complex reaction reversible- consecutive first-order reaction 

分 类 号：O643.1[理学—物理化学]