Ion-selective Membrane Electrodes for the Determination of Heavy Metals Construction characterization and applications

摘要

This paper presents the construction and characterization of some ion-selective membrane electrodes (ISE) for the determination of the following cations Cu+2, Cd+2, Ni+2, Pb+2, and Hg+2 in a PVC matrix using as electroactive material acetoacetanilide, dicyclohexan-24-crown-8, dibenzo-18-crown-6, dicyclohexyl-18-crown-6 or poly-(4-vinyl pyridine). For each electrode the following characteristics have been established: linear response range, limit of quantification, response time and selectivity. The electrodes were used for the in vitro potentiometric determination of traces of heavy metals in some aqueous extracts orally administered for therapeutic purposes.