Exploitation of bis(tert‐butylaminomethyl)pyridine as a chemical modifier in a carbon paste electrode for sensitive and selective potentiometric determination of Al3+ ion in pharmaceutical and water samples

Abstract

AbstractThe fabrication of a novel bis(tert‐butylaminomethyl)pyridine pincer ligand‐based ionophore in a carbon paste electrode (CPE) matrix for Al3+ ions was investigated. With a Nernstian slope of 20.05±0.27 mV decade−1 and a low detection limit of 1.0×10−7 mol L−1, the electrode demonstrated an excellent response for the Al3+ ion over a broad concentration range from 1.0×10−7 to 1.0×10−1 mol L−1. The formula for the graphite paste that produced the greatest results was 69.44 % graphite, 27.78 % tricresyl phosphate (TCP) binder, and 2.78 % ionophore. This pincer ligand‐based electrode worked well with aqueous Al3+ solutions that had pH values between 2.5 and 5.5. It may be used for at least 4 months without any detectable potentials digression and has a reasonably quick response time (5 s). The suggested graphitic paste electrode demonstrated strong Al3+ ion selectivity over a broad range of other cations. The isothermal coefficient of the electrode, which was determined to be 0.2884×10−3 V °C−1, was calculated by looking at the impact of test solution temperature on electrode potentials. The suggested electrode was also applied to non‐aqueous media with an aqueous‐non‐aqueous volume ratio of up to 75 : 25. The data acquired using this CPE as an indicator electrode for the potentiometric measurement of Al3+ ions in several actual samples was equivalent to that attained using atomic absorption spectroscopy (AAS).