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Iron (III)-Selective Sensor Based on Modified Glassy Carbon Electrode
(2018) MECHERI NACIRA
The aim of this work is intended to make a comparison between the effects of the presence of potassium ferricyanide (K3[Fe(CN)6]) / potassium ferrocyanide K4[Fe(CN)6]) and the absence of any redox couple for iron (III) determination in aqueous solution using modified Glassy Carbon Electrode. Benzo-18-crown-6 is employed as ionophores for preparing PVC-based membrane sensors selective to iron (III), plasticized with Di-n-octyl phthalate, Tetrabutylammonium tetraphenylborate was used as additive. The measurements performed and characterized by square wave voltammetry methods. Agents were optimized for iron (III) stripping analysis and optimal condition was frequency of 20 Hz, step potential of 6 mV, amplitude of 40 mV, the modified glassy carbon electrode immersed in standard solutions of Fe(III) at PH 2.0 .The measurements are performed in 0.1M NaNO3 and 0.1 M HCl (pH 7). The square wave voltammograms showed a sharp peak around positive potentials + 0.260 V that was used for construction of the calibration curve in a work range from 10-10 until 10-6 mol L-1 of iron, exhibiting a linear correlation coefficient of 0.99, a detection limit of 10-10 mol L-1 and sensibility of 9. /mol L-1, especially, those obtained by the presence of redox couple better than the absence of external redox.