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 detection of 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 mol LT' and in a pH range of 3.0-9.0. The electrode shows a detection limit of 3.5 x 10 mo1 U'. The influence of membrane composition, the pH of the test solution, and the interfering ions on the electrode performance was investigated. The proposed electrode shows good discrimination of Al3+ ion from several cations. The effect of temperature on the electrode response shows that the temperature higher than 50 °C deteriorates the electrode performance. The electrode was found to work well under laboratory conditions. This sensor not only was 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.