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M. G. Gevorgyan ¹, G. A. Parsadanyan ¹, N. M. Beylerian ¹

Affiliations
1 Yerevan State University, Departments of Physical and Colloid Chemistry, Ecology and Nature Conservation, Yerevan 375025, A. Manoogian St. 1, AM

Abstract

It has been established that phosphate ions which are in carbonate, inhibit simultanously the formation of both Michaelis (ES) and kinetically inactive complexes (ES₂).

Keywords

Carbonate, Chernozem, Substrate Inhibition, Competitive Inhibition, Phosphate Ion.

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M. G. Gevorgyan ¹, N. M. Beylerian ¹

Affiliations
1 Yerevan State University, Department of Physical and Colloid Chemistry, Yerevan 3 75025, A. Manougian St. 1, AM

Abstract

The kinetics of the reaction of Ph₂NH (A) with S₂O^2-₈ under O₂ free condition was studied in homogenous medium using H₂O+dioxane (33% by volume) solution in presence of the PDS anion active micelles. In absence of PDS micelles, Ph₂NH oxidation is consecutive, the final product being diphenylbenzidine violet. When PDS micelles are present, the over-all reaction rate decreases. At [E-30]₀ ≥ 0.16 M, the reaction is stopped at the stage of tetraphenylhydrazine (TPhH) formation, which leads to slowing down of the over-all rate of S₂O^2-₈ consumption. This fact has been explained assuming that water soluble S₂O^2-₈ and oil-soluble TPhH are localized in different loci in the reaction medium. The distribution coefficient (P_A) of the reductant between micellar and water as well as water-EtOH-dioxane solutions has been determined.

Keywords

Peroxydisulfate, Diphenylamine, Surfactant, Action of Micelles on Oxidation Rate.

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