New modified selective platinum electrode based on poly (ethylene glycol) for Iron (III) detection in real water
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Date
2017-11-04
Journal Title
Journal ISSN
Volume Title
Publisher
MECHERI NACIRA
Abstract
Purpose – This work aims to determine iron (III) in real water by using a new amperometric sensor on the basis of polyethylene glycol (PEG) to test
and characterize a new modified selective platinum electrode.
Design/methodology/approach – In this review, the authors focus on testing and characterizing several polymeric membranes by using cyclic
voltammetry and square-wave voltammetry (SWV) methods to differentiate the nature of plasticizers (2-Nitrophenyl octyl ether [NPOE], Di-n-octyl
phthalate, Bis (2-ethylhexyl) sebacate, PEG. The authors have evaluated the possibility of using crown ether and three zeolite ionophore (faujasite
[FAU], Chabazite and ZSM-5) matrixes as novel materials for the selective determination of iron (III) using SWV for the best membranes.
Findings – The results demonstrated that the modified platinum electrode presents linear dependence of amperometric signal with a wide linear
range of 10 9 to 10 4 mol.L 1 for iron determination, revealing a detection limit of 10 10 mol.L 1 and amperometric sensibility of 58.58 mA/mol.
L
1
. The slope of the membrane plasticized with PEG calibration curve is six times higher than that of the other membranes. It was noticed that
when the crown ether and the three zeolite ionophores were used, as a new detective material for iron with the membrane plasticized with PEG, the
expected results were highly proven. The modified platinum electrode showed high selectivity to iron (III) when the heavy metal ions such as Ni (II),
Al (III), Zn (III), Cd (II), Gd (II) and Cu (II) were present.
Originality/value – The utility of the method and the efficiency of the best membrane sensor have been accurately tested by the determination of
iron in real water samples of Hassi Messaoud, south of Algeria.
Description
Crown ether is a successful neutral carrier when it is used to
detect the production of iron (III)-selective membrane
electrodes. Among all tested sensing matrices, the membrane
based on PVC/PEG/TBATPB/crown ether exhibits the best
electrochemical performances in terms of sensitivity and
stability. The modified electrode shows high stability in
repetitive experiments owing to good adhesion and high affinity
of the sensing membrane towards the iron (III) ions. This
behaviour can be explained by the formation of complexes. The
developed electrode showed an attractive candidate as an iron
(III) sensor for practical analysis applications.
The optimized formulation of the membrane (i.e. 29-mg
PVC, 67-mg PEG, 2-mg TBATPB, 2-mg benzo-18-crown-
6) resulted in a linear concentration range of 10 9 to 10 4
mol.L 1 with a slope of 58.58 mA/mol.L 1 and an LOD of
10 10 mol.L 1. These results could help us to choose the best
plasticizer (PEG) with suitable concentration in real water.
As a result, the validity of the used electrochemical method
and the applicability of the ion sensor were successfully tested
by the determination of iron (III) ions in several real water
samples of the ZCINA, located in the north of Hassi
Messaoud, south of Algeria. The preparation of the electrode
is simple, not expensive.
Keywords
Citation
https://doi.org/10.1108/ SR-01-2017-0020