The kinetics of oxidation of nitrite to nitrate by peroxornonophosphoric acid in aqueous acid medium have been studied. The observed monotonic fall in rate with increasing pH of the medium has been rationalized on the basis of proton-dissociation equilibria of the substrate as well as the oxidant sp
Oxidation of amino acids by peroxomonophosphoric acid—a kinetic study
✍ Scribed by Ganesh P. Panigrahi; Ramesh C. Paichha
- Publisher
- John Wiley and Sons
- Year
- 1991
- Tongue
- English
- Weight
- 544 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0538-8066
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✦ Synopsis
Aliphatic amino acids are smoothly oxidized by peroxomonophosphoric acid (PMPA) in the pH region 6-10. Kinetic studies reveal second order dependence in the amino acid not observed hitherto in any of the PMPA oxidations. Dependence in PMPA is unity. Rate-pH profile yields a maximum around pH 8. The reaction path includes oxidation steps due to HzP05-and HPO;' . Second order dependence in the amino acid has been attributed to participation of two Zwitter-ionic molecules of the amino acid to form a nucleophile.
📜 SIMILAR VOLUMES
The kinetics of dimethyl sulfoxide (DMSO) oxidation by peroxomonophosphoric acid (PMPA) in aqueous medium a t 308 K and I = 0.4 mol/dm3 follow the rate expressions In the pH range from 0 to 2, where k l and kz are 5.092 X 10-1 dm3/mol sec and = 0, respectively; in the pH range from 4 to 7, where k2
The kinetic study of the permanganic oxidation of some amino acids (glycine, L-alanine, L-ϰ-amino-n-butyric acid, L-norvaline, and L-norleucine) has been carried out in buffered acid medium at 1 Ͻ pH Ͻ 3 using a spectrophotometric technique. An autocatalytic effect due to Mn 2ϩ ions was found in all
The kinetics of the oxidation of mandelic acid (MA) by permanganate in aqueous alkaline medium at a constant ionic strength of 1.0 mol dm À3 were studied spectrophotometrically. The reaction shows first-order kinetics in [permanganate ion] and fractional order dependences in [MA] and [alkali]. Addit
The reaction of peroxomonophosphoric acid and hydrazinium ion in acid perchlorate solutions occurs as per stoichiometry (i), and the rate law (ii) at large [NzH~'], (i) where K& is the first acid dissociation constant of H3P05 and kl and kz are rate constants found to be 2.6 x s-' and 5.0 x lo-' M
## Abstract The kinetics of oxidation of six α‐amino acids (AA) by peroxomonosulfate (PMS) ion at pH 4.2 and 35°C are investigated once again. The rate of disappearance of peroxomonosulfate at constant [AA] and [H^+^] follows the equation equation image The experimental results suggest that the h