ION-SELECTIVE ELECTRODES (ISES) BASED ON IONOPHORE ARE USED WIDELY AND ESPECIALLY PLASTICIZED POLYVINYL CHLORIDE (PVC) MEMBRANE ISES BASED ON SEVERAL KINDS OF NEUTRAL CARRIERS ARE CONVENIENT ANALYTICAL TOOLS FOR DETERMINING IONIC SPECIES IN CLINICAL CHEMISTRY. ION-SELECTIVE ELECTRODES HAVE MANY MOR ADVANTAGE OVER THE TRADITION METHODS. THEY PROVIDE ACCURATE, REPRODUCIBLE, FAST AND OFTEN SELECTIVE DETERMINATION OF VARIOUS IONIC PARTICLES . ACCORDING TO THE IMPORTANCE OF ALUMINIUM IN THE PATHOLOGY OF PARKINSON AND ALZHEIMER DISEASES AND IT’S IMPORTANCE IN THE PREPARATION OF DRINKING WATER, WE INTENSIVELY NEED TO MEASURE THE CONCENTRATION OF ALUMINUM IN SAMPLES. IN THIS WORK, DYNAMIC RESPONSE TIME AND REVERSIBILITY OF THE AL3+ ION-SELECTIVE ELECTRODE BASED ON (1E, 2E) -N1, N2 DIHYDROXY -N1, N2-BIS (4-HYREXY PHENYL) OXALIMIDAMID (DBO) WERE STUDIED. THE FORMATION CONSTANT, DHO, DSO AND DGO WERE CALCULATED FOR COMPLEXATION OF AL3+- IONOPHORE AND THE AMOUNTS ARE 33.00×10-1KJ/MOL, 2.38×10-1 KJ/MOL AND -37.87×10-1 KJ/MOL RESPECTIVELY. THE LIGAND STRUCTURE AND ITS COMPLEX STUDIED BY AB INITIO HF CALCULATIONS USING A STANDARD 6-311G BASIS SET AND LANL2DZ. STABILITATION ENERGY FOR LIGAND AND ITS COMPLEX OBTAINED- 1054.961610 HARTREE MOL-1 AND -1295.488139 HARTREE MOL-1 RESPECTIVELY.