Modified carbon paste electrode for potentiometric determination of aluminium ion in spiked real water sample

Resumo

The present paper describes the development of a new chemically modified carbon paste electrode based on azithromycin (AMC) that considered as a selective aluminium recognition agent in the carbon paste electrode (CPE). This electrode was fully characterized in terms of composition, response time, usable pH range and temperature. The electrode exhibited a Nernstian response for Al³⁺ ion over a concentration range from 7.0 × 10^–6 to 1.0 × 10^–2 mol L^–1 with a slope of 21.3 ± 0.18 mV decade^–1 and the limit of detection was 6.0 × 10^–6 mol L⁻¹. It had a response time of about 6 s. The proposed sensor possesses a very good selectivity with respect to a variety of other cations. Finally this modified electrode was applied for the determination of the concentration of Al³⁺ ion in different water samples and the obtained results were comparable with those obtained with atomic absorption spectrometer (AAS).