Author(s)

Refat F. Aglan, Mahmoud S. Rizk, Gehad G. Mohamed, Ahmed H. El-Wahy, Hala A. Mohamed

Chemistry Administration, Cairo, Egypt.
Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt.
Hot Laboratory Center, Atomic Energy Authority, Cairo, Egypt.

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.

Triazol Ionophores; Ferrous Ion Determination; Modified Carbon Paste Electrodes

R. Aglan, M. Rizk, G. Mohamed, A. El-Wahy and H. Mohamed, "Preparation and Properties of a New Carbon Paste Iron Selective Electrodes and Their Applications," American Journal of Analytical Chemistry, Vol. 5 No. 2, 2014, pp. 140-148. doi: 10.4236/ajac.2014.52017.