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۱Electrochemical Investigation of Ni(II) Ions in Nickel Chloride and Nickel Sulfate at Carbon Paste Electrode: A Cyclic Voltammetric Study
اطلاعات انتشار: Analytical & Bioanalytical Electrochemistry، پنجم،شماره۶، Dec ۲۰۱۳، سال
تعداد صفحات: ۱۱
Nickel bearing compounds exhibit excellent electrochemical properties in an alkaline medium due to the reversible one–electron redox process of the couple Ni(III)\Ni(II). Nickel(II) ions were investigated in the compounds like nickel chloride and nickel sulfate at carbon paste electrode by using cyclic voltammetric technique. The well–defined redox peaks were observed for both nickel chloride and nickel sulfate compounds in 0.1 M KOH solution as supporting electrolyte at scan rate of 100 mVs–1. The effect of scan rates and concentrations were studied and the effects show good linear relationship with the peak currents. The cyclic voltammetric behavior of Ni(II) ions were also examined in 1 M KCl solution as supporting electrolyte. The Ni(II) ions shows well defined redox peaks in presence of potassium ferricyanide as a mediator.

۲Voltammetric Determination of Folic acid in presence of Dopamine and Ascorbic Acid at Poly (Alanine) Modified Carbon Paste Electrode
اطلاعات انتشار: Analytical & Bioanalytical Electrochemistry، هفتم،شماره۴، Aug ۲۰۱۵، سال
تعداد صفحات: ۱۲
A procedure for the electropolymerization of alanine on the surface of bare carbon paste electrode (CPE) in presence 0.2 M acetate buffer (pH 5.0) solution as a supporting electrolyte using cyclic voltammetric technique was developed. The optimization of electropolymerized modified carbon paste electrode (MCPE) was achieved at 25 cycles. Further the poly (alanine) MCPE was used for the electrochemical detection for the folic acid (FA) at pH 5.0 and shows excellent electrocatalytic activity towards FA when compared to the bare CPE. The various parameters such as effect of scan rate, concentration of FA and the effect of pH were studied at MCPE. From the scan rate it was found that the electrode process was adsorption–controlled process. The limit of detection of FA was calculated at MCPE and the simultaneous determination FA, DA and AA shows three well defined oxidation peaks at poly (alanine) MCPE.
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