New Potentiometric Iron(III)-selective Electrode Based on a Tris(Aminophenolate) as a Sensing Molecule

Title:New Potentiometric Iron(III)-selective Electrode Based on a Tris(Aminophenolate) as a Sensing Molecule

Volume: 11 Issue: 4

Author(s): Rati Kanta Bera, Suban K. Sahoo, Minati Baral and B. K. Kanungo

Affiliation:

Keywords: PVC membrane, nernstian slope, Fe³⁺, ISE, selectivity coefficients.

Abstract: A novel PVC-incorporated membrane electrode selective for iron(III) is described. The sensor is based on the use of novel tris(aminophenolate) sensing molecule Cis,cis-1,3,5-tris{(2- hydroxybenzyl)aminomethyl}cyclohexane (THAC, L). The optimized membrane containing THAC, PVC and o-nitrophenyloctyl ether in the ratio 4:33:63 exhibits the best performance by means of range of concentration (1.0x10^-5 to 1.0x10^-1M), slope (19.4 mV/decade) and detection limit (7.0x10^-6 M). The sensor exhibited a firm response time (< 15 s), extensive working pH range (3.0-6.5), non-aqueous steadiness (up to 20%) and having sufficient long life time (120 days). The potentiometric selectivity coefficients obtained using match potential method (MPM) stipulates outstanding discrimination for Fe³⁺ ions among the various cations. Additionally, the sensor is found to be conveniently active like a potentiometric indicator electrode in the determination of Fe³⁺ ions against EDTA.

Cite this article as:

Kanta Bera Rati, K. Sahoo Suban, Baral Minati and Kanungo B. K., New Potentiometric Iron(III)-selective Electrode Based on a Tris(Aminophenolate) as a Sensing Molecule, Current Analytical Chemistry 2015; 11 (4) . https://dx.doi.org/10.2174/1573411011666150403225603