SciELO - Scientific Electronic Library Online

 
vol.27 issue5Parameter optimization for pesticide multiresidue determination using SPME in water samplesExtraction of Al(III), Cr(III) and Fe(III) from ethanolic medium by anilinepropylsilica xerogel author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Química Nova

Print version ISSN 0100-4042On-line version ISSN 1678-7064

Abstract

PEREIRA, Arnaldo César  and  KUBOTA, Lauro Tatsuo. Optimization of the carbon paste electrode preparation containing riboflavin immobilized on an inorganic support. Quím. Nova [online]. 2004, vol.27, n.5, pp.725-729. ISSN 0100-4042.  http://dx.doi.org/10.1590/S0100-40422004000500009.

The aim of this work was to optimize the preparation of electrodes with riboflavin (RF) immobilized on a silica surface modified with niobium oxide and carbon paste. Electrode preparation was optimized employing a factorial design consisting of two levels and three factors. The electrochemical properties of immobilized RF were investigated by cyclic voltammetry. The factorial analysis was carried out analysing the current intensity (Ipa). It was possible to optimize the electrode to get the best reversibility in the redox process, i. e. the lowest separation between anodic and cathodic peak potentials and a current ratio close to unity. The concentration of supporting electrolyte has a small effect. The proportion has the highest effect and the interaction factor between proportion and mixture has also a significant effect on the current intensity.

Keywords : carbon paste electrode; optimization of electrochemical properties; factorial design.

        · text in Portuguese     · Portuguese ( pdf )

 

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License