Voltammetric Behaviour of CobaJt(II) at N-p-ChIOI'ophenylcinnamohydt'oxamic Acid Modified Carbon Paste Electrode
No Thumbnail Available
Date
1998-06
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
A new preconcentration and voltammetric method was developed for the determination of
Co(TI) with N-p-chlorophenylcinnamohydroxamic acid (CPCHA) modified carbon paste electrode.
The measurements were carried out using cyclic voltammetry and differential pulse anodic
stripping voltammetry with closed circuit deposition of cobalt(II) at the electrode surface. The
effects of several experimental parameters such as modifier composition in the carbon paste
electrode, pH and concentration of supporting electrolyte, deposition potential, deposition time,
and other instrumental parameters were studied for analytical application. A linear response ""as
obtained in the concentration range 1 x 10-6 - 4 x 10.5 M Co(II) with a detection limit of 3,3 x 10.7
M for a 5 min deposition time. A relative standard deviation of 3 . 1 % was obtained for eight
successive determinations of 1 x 10.5 M Co(JI). Many coexisting metal ions had little or no effect
on the determination of cobalt(II). The method was applied for the determination of cobalt in
vitamin B!2' The new electrode offered many attractive properties such as high stability, self
cleaning ability, the use of non-dearated solutions and can be used repeatedly without
regeneration
Description
Keywords
CobaJt(II) at N-p-ChIOI'ophenylcinnamohydt'oxamic Acid