Kinetics and mechanism of oxidation of l-ascorbic acid by peroxomonophosphate in aqueous acid medium

被引：0
|
作者：
Soni, Narendra K. [1 ]
Sailani, Riya [1 ]
Khandelwal, C. L. [1 ]
Sharma, P. D. [1 ]
机构：
[1] Univ Rajasthan, Dept Chem, Jaipur 302055, Rajasthan, India
来源：
INTERNATIONAL JOURNAL OF CHEMICAL KINETICS | 2013年 / 45卷 / 01期
关键词：
CHELATE CATALYZED OXIDATION; PERCHLORATE-MEDIA; METAL ION; REDUCTION; COMPLEXES; OXYGENATION; PEROXIDE;
D O I：
10.1002/kin.20741
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The kinetics of oxidation of l-ascorbic acid (H(2)A) by peroxomonophosphate in acid aqueous medium has been studied. The stoichiometry of the reaction corresponds to the reaction as represented by the equation H3PO5 + H(2)A -> H3PO4 + H2O + A where A is dehydroascorbic acid. The reaction is second order versus first order with respect to each reactant. The rate is retarded by hydrogen ion concentration. A plausible reaction mechanism has been suggested. The derived rate law (2) from such a mechanism accounts for all experimental observations: d[H(2)A]/dt = (k(1)k(2)[H+] + K2K1K2)/(K-1 + [H+])(K-2 + [H+]) [H3PO5][H(2)A] Such pH dependence is somewhat different from that observed in the case of metal ion oxidants. (c) 2012 Wiley Periodicals, Inc. Int J Chem Kinet 45: 4116, 2013
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页码：41 / 46
页数：6
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