Document Detail


Electrocatalytic determination of ascorbic acid on a glassy carbon electrode chemically modified with cobalt pentacyanonitrosylferrate.
MedLine Citation:
PMID:  15984207     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
An electrochemically prepared thin film of cobalt pentacyanonitrosylferrate (GC/CoPCNF) was used as a surface modifier for glassy carbon electrodes. The oxidation of ascorbic acid on a glassy carbon electrode modified with GC/CoPCNF as a working electrode was studied using cyclic voltammetry, rotating disk electrode (RDE) voltammetry and chronoamperometry in a 0.25 M KNO3 + 0.25 M phosphate buffer (pH 7) solution. The glassy carbon modified with CoPCNF showed good electrocatalytic activity toward ascorbic acid oxidation. The kinetics of the catalytic reaction was investigated, and the average value of the rate constant (k) for the catalytic reaction and the diffusion coefficient (D) were evaluated by different approaches for ascorbic acid, and were found to be 3.3 +/- 0.3 x 10(2) M(-1) s(-1) and 3.2 +/- 0.3 x 10(-6) cm2 s(-1), respectively.
Authors:
Reza Emamali Sabzi; Mohammad Hussein Pournaghi-Azar
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Analytical sciences : the international journal of the Japan Society for Analytical Chemistry     Volume:  21     ISSN:  0910-6340     ISO Abbreviation:  Anal Sci     Publication Date:  2005 Jun 
Date Detail:
Created Date:  2005-06-29     Completed Date:  2006-05-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8511078     Medline TA:  Anal Sci     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  689-92     Citation Subset:  IM    
Affiliation:
Department of Chemistry, Faculty of Science, Urmia University, Urmia, Iran. rezasabzi@yahoo.com
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MeSH Terms
Descriptor/Qualifier:
Algorithms
Ascorbic Acid / analysis*
Carbon
Catalysis
Electrochemistry
Electrodes
Indicators and Reagents
Kinetics
Organometallic Compounds / chemistry*
Chemical
Reg. No./Substance:
0/Indicators and Reagents; 0/Organometallic Compounds; 0/cobalt pentacyanonitrosylferrate; 50-81-7/Ascorbic Acid; 7440-44-0/Carbon

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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