A highly selective PVC membrane electrode for Al 3+ based on salicylaldehyde salicyloyl hydrazone as a neutral carrier has been prepared and studied. The sensor exhibits a good response for Al 3+ over a linear range of 9.0 × 10 -6 to 1.0 × 10 -1 mol/L, with a Nernstian slope of 20.0 ± 0.2 mV/decade and detection limit of 7.0 × 10 -6 mol/L. Selectivity coefficients determined by the method of separate solution indicate high selectivity for Al 3+ . The response mechanism was discussed in view of UV-Vis spectroscopy technique and the A.C. impedance technique. It was used as an indicator electrode in potentiometric titration of Al 3+ with EDTA and in the determination of Al 3+ in real samples. The electrode has a relatively fast response time, long life time and satisfactory stability.

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