Octaethylporphyrin as an ionophore for aluminum potentiometric sensor based on carbon paste electrode

A new sensor to quantitatively sense aluminum in real sample conditions is presented that uses the potentiometric ion selective electrodes. Aluminum is a cation that plays an important role in the environmental process. This approach is proposed to determine aluminum levels in real samples in the required range (10^?6–10^?2 M). Carbon paste electrode (CPE) is introduced here as a potentiometric sensor to measure free concentration of aluminum ion. Octaethylporphyrin (OEP) acts as a selective aluminum recognition agent in the CPE. The suitable selectivity coefficient is obtained for the CPEs compare to interfering cation. The Nernstian slope and detection limit are achieved 18.4 mV/decade and 2.5 × 10^?6 M Al³⁺, respectively. Finally, the proposed method is applied to determine aluminum concentration in real water samples and the result of this method is in agreement with the result of atomic absorption spectroscopy (AAS).