13408-63-4Relevant academic research and scientific papers
Kinetic and Mechanism of Oxidation of Ethylenediaminetetraacetic Acid by Alkaline Hexacyanoferrate(III)
Chaturvedi,Sarkar, Joy,Singh,Naik
, p. 43 - 46 (2007/10/03)
The kineties of oxidation of ethylenediaminetetraacetic acid (EDTA) by hexacyanoferrate(III) have been studied spectrophotometrically (λ = 420 nm) at pH = 11.0, I = 0,5 mol dm-3 (NaCIO4) and temperature 45°. The examination of rate data shows that the rate law is d[Fe(CN)63-]/dt = kf [Fe(CN)63-] [EDTA4-] with a second order rate constant kf = 4.5 × 10-2 dm3 mol-1 s-1. The rate of reaction has been followed as a function of pH in the range 7.5-12.0. The rate is found to increase. The reactive species of EDTA are H2L2-, HL3- and L4-. The resolved rate constants due to the reaction of [Fe(CN)6]3- with EDTA4-, HEDTA3- and H2EDTA2- are calculated. The effect of ionic strength is found to be positive. The activation parameters are also calculated from Arrhenius plots. An electron transfer mechanism is suggested for the reaction.
A Kinetic Study of the Oxidation Reaction of L-Cysteine by Potassium Hexacyanoferrate(III) in Aqueous Acidic Medium
Chaturvedi,Srivastava, Neena,Sarkar,Naik
, p. 159 - 161 (2007/10/03)
Kinetics of oxidation of L-cysteine by one-electron oxidant, potassium hexacyanoferrate(III) have been investigated spectrophotometrically at 420 nm as a function of temperature, pH and ionic strength. The rate data indicate first order dependence each in [Fe(CN)63-] and [CyS]. The reactive species of cysteine are neutral cysteine and protonated cysteine. The effect of ionic strength on the reaction has little effect. The activation parameters ΔH* and ΔS* have also been calculated. The results support for an associative mechanism for the reaction.
