Voltammetric Behaviour Of Cobajt(ii) At N-p-chioiophenylcinnamohydtoxamic Acid Modified Carbon Paste Electrode

A new preconcentration and voltammetric method was developed for the determination ofrnCo(TI) with N-p-chlorophenylcinnamohydroxamic acid (CPCHA) modified carbon paste electrode.rnThe measurements were carried out using cyclic voltammetry and differential pulse anodicrnstripping voltammetry with closed circuit deposition of cobalt(II) at the electrode surface. Therneffects of several experimental parameters such as modifier composition in the carbon pasternelectrode, pH and concentration of supporting electrolyte, deposition potential, deposition time,rnand other instrumental parameters were studied for analytical application. A linear response ""asrnobtained in the concentration range 1 x 10-6 - 4 x 10.5 M Co(II) with a detection limit of 3,3 x 10.7rnM for a 5 min deposition time. A relative standard deviation of 3 . 1 % was obtained for eightrnsuccessive determinations of 1 x 10.5 M Co(JI). Many coexisting metal ions had little or no effectrnon the determination of cobalt(II). The method was applied for the determination of cobalt inrnvitamin B!2' The new electrode offered many attractive properties such as high stability, selfrncleaning ability, the use of non-dearated solutions and can be used repeatedly withoutrnregeneration

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