TITLE:
Preparation and Properties of a New Carbon Paste Iron Selective Electrodes and Their Applications
AUTHORS:
Refat F. Aglan, Mahmoud S. Rizk, Gehad G. Mohamed, Ahmed H. El-Wahy, Hala A. Mohamed
KEYWORDS:
Triazol Ionophores; Ferrous Ion Determination; Modified Carbon Paste Electrodes
JOURNAL NAME:
American Journal of Analytical Chemistry,
Vol.5 No.2,
January
27,
2014
ABSTRACT: The new ferrous-selective modified carbon paste
electrodes (I and II) based on
5,5’-(propane-1,3-diylbis(sulfanediyl))bis(3-benzyl-4H-1,2,4-triazol-4-amine)
(electrode I, A-ionophore) and 5,5’-(butane-1,4-diyl-bis(sulfane- diyl))bis(3-benzyl-4H-1,2,4-triazol-4-amine) (electrode II,
B-ionophore) as ionophores are described. These electrodes exhibit Nernstian slopes of 30.2 ± 0.5 and 29.1 ± 0.5 mV·decade-1, linear range of 1.0 × 10-7 - 1.0 × 10-2 mol·L-1 Fe(II) ion and detection limit
of 1.0 × 10-7 mol·L-1 Fe(II)
ion for electrode (I) and
electrode (II), respectively. Both electrodes (I and II) have a fast response
time of about 15 sand can be used for at least 3 months. The two electrodes
revealed a good selectivity for Fe(II) over a wide variety of other metal ions and could be
used in the pH range of 1.8 - 3.0 without any divergence in potential. The proposed
sensors were successfully applied for the determination of Fe(II) ion in
different real samples.