Contribuição à determinação de cobre, chumbo e cádmio em águas naturais, por potenciometria inversa com permuta de meios.

Abstract

The present work summarizes studies related to the analytical determination of copper(II), lead(II) and cadmium(II) in water samples by inverse potentiometry, using a composite working electrode, with medium exchange and in the presence of chloride of lithium. The usefulness of the method was proved by analyzing a certified seawater sample, NASS-4, obtaining a result comparable to the values already published in the literature. With an estimated detection limit of 0.08µg/l, for an analysis duration of about 10 minutes per sample, the proposed technique has a field of application equal to or even greater than that of electrothermal atomic absorption spectroscopy insofar as it requires to be combined with the pre-concentration techniques of the ions under study. (TRADUÇÃO NOSSA)