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Electrochemical Behavior of Menadione on Glassy Carbon Rotating Disk Electrode (RDE)
Author(s) -
Alonso Lydia,
Palmero Susana,
Muñoz Emma,
Sanllorente Silvia,
GarcíaGarcía M. Angeles
Publication year - 2000
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/1521-4109(200006)12:10<757::aid-elan757>3.0.co;2-b
Subject(s) - analytical chemistry (journal) , diffusion , electrochemistry , glassy carbon , chemistry , charge transfer coefficient , electrode , mass transfer , diffusion layer , thermodynamics , cyclic voltammetry , chromatography , physics
The 2‐methyl‐1,4‐naphthoquinone electrochemical behavior on glassy carbon rotating disk electrode has been the focus of this study. In order to obtain the best results, the optimal conditions for this voltammetric study have been determined, by performing a chemometric analysis of the data. The influence of five factors on the diffusion current has been studied, finding that the greatest effect is due to three of them. The optimum values for all of these parameters were: pH 7, v (potential sweep rate)=87.1 mV/s, C met (methanol concentration)=4.14 %(v/v), t eq (equilibrium time)=2.5 min, and t dea (purge time)=2 min. These data were used to determine the mass transfer parameters: diffusion coefficient ( D =(1.4±0.3)×10 –4 cm 2 /s) and diffusion layer thickness (δ=(6.6±0.5)×10 –3 cm), the kinetic parameters: charge transfer constant ( K 0 =2.91×10 –6 cm/s) and charge transfer coefficient (α=0.248), and the standard potential ( E 0 =0.083±0.011 V).