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.