Modified Carbon Paste Ion Selective Electrodes for the Determination of Iron (III) in Water, Soil and Fish Tissue Samples

• Published in: International journal of electrochemical science Vol. 8; no. 1; pp. 1469 - 1486
• Main Authors: Ali, Tamer Awad, Mohamed, Gehad G., El-Dessouky, Maher M.I., Abou El Ella, Salwa M., Mohamed, Rabab T.F.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.2013
• Subjects: Ferric chloride; Ionophores; Modified carbon paste electrode; Potentiometric determination; Water samples; Ferric chloride; Modified carbon paste electrode; Potentiometric determination; Ionophores; Water samples
• ISSN: 1452-3981; 1452-3981
• DOI: 10.1016/S1452-3981(23)14112-5

The construction, performance characteristics, and application of iron(III) sensors based on (5,5'- (propane-1,3-diylbis(sulfanediyl))bis(3-benzyl-4H-1,2,4-triazol-4-amine) (ionophore A), 5,5'-(butane- 1,4-diylbis(sulfanediyl))bis(3-benzyl-4H-1,2,4-triazol-4-amine) (ionophore B), 7,8,16,17-tetrahydrodibenzo[e,m] [1,4,8,11]dioxadiazacyclotetra-decine (ionophore C) and [3{(1E)-2-[3-2-[3- [(1E)-2-aza-2-(3-carboxyphenyl)vinyl]phenoxy}-ethoxy)phenyl1]-1-azavinyl} benzoic acid (ionophore D) are reported in this paper. The sensors are prepared by incorporating of A, B, C and D ionophores into a plasticized carbon paste electrodes to form electrodes I, II, III and IV, respectively. Under the optimized conditions, the electrodes reveal Nernstian slopes of 20±0.32, 20.3±0.46, 19.2±0.62 and 21±0.25 mV decade-1 over a wide concentration range from 1 × 10-6 to 1 × 10 2 mol L-1 with a detection limit of 6.4 × 10-7, 6.4 × 10-7, 1 × 10-6 and 4.8 × 10-7 mol L-1 at pH range from 1.8- 3, 1.8- 3, 2- 3.5 and 1.8- 3.5 for electrodes I, II, III and IV, respectively. The sensors are stable for 86, 74, 66 and 95 days for electrodes I, II, III and IV, respectively. without any measurable divergence in the potential characteristics and exhibit good selectivity with respect to alkali, alkaline earth and transition metal ions (e.g. Na(I), K(I), Ba(II), Ca(II), Zn(II), Cd(III), Co(II), Mn(II), Ni(II), Cu(II), Pb(II) and Al(III)). This method is successfully applied for potentiomertric determination of Fe(III) in water, soil and fish tissue samples, and the results obtained agreed with those obtained with atomic absorption spectrometer (AAS).