Preparation and Application of Al3+ - Sensor Based On (2Z) — Methyl 2 — ((z) (p-tolylimino) -3-Ethyl —4-0xothiazolidin —5— Ylidene Acetate in PVC Matrix

Al3+-Potentiometric sensor, based on (2Z) -methyl 2- ((z) (p-tolylimino)-3-ethyl -4-oxothiazolidin -5- ylidene) Acetate (MTEOY) as a neutral ionophore, was successfully developed for the detectionof Al3+ in aqueous solutions. The electrode responds to Al3+ ion with a sensitivity of 19.8 ± 0.1 mV/decade over the range 1.0 x 10-8- 1.0 x 10-1 mol LT' and in a pH range of 3.0-9.0. The electrodeshows a detection limit of 3.5 x 10 mo1 U'. The influence of membrane composition, the pH of thetest solution, and the interfering ions on the electrode performance was investigated. The proposedelectrode shows good discrimination of Al3+ ion from several cations. The effect of temperature onthe electrode response shows that the temperature higher than 50 °C deteriorates the electrodeperformance. The electrode was found to work well under laboratory conditions. This sensor not onlywas used in determination of AV. i n real samples but also was used to determination of Ali'concentration in the presence of certain interfering ions.