Iron (III)-Selective Sensor Based on Modified Glassy Carbon Electrode
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Date
2018
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Abstract
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.
Description
Iron (III)-Selective Sensor Based on
Modified Glassy Carbon Electrode was
elaborated.
The measurements performed and
characterized by square wave voltammetry
methods. The 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 external
redox couple were studied .The results
demonstrated that sensor could be used for the
determination of Fe(III) in the absence and in
the presence of redox couple, the better results
in the presence of potassium ferricyanide
(K3[Fe(CN)6]) / potassium ferrocyanide
K4[Fe(CN)6]) Redox Couple,because Fe(III) was
reduced to Fe(II) leaving the surface,it will be
seen that in the absence of redox couple have
smaller slopes. The preparation of the electrode
is simple and the membrane composition
including (PVC; Di-n-octyl phthalate; TBATPB
and benzo-18-crownand 2 respectively).
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Citation
17th International Meeting on Chemical Sensors - IMCS 2018