The new ferrous-selective modified carbon paste electrodes (I and II) based on 5,5 ’ -(propane-1,3-diyl bis(sulfa nediyl))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 elec trodes 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), respect ively. 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.
KeywordsTriazol IonophoresFerrous Ion DeterminationModified Carbon Paste Electrodes
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