Reversible potentiometric ascorbic acid solid-state membrane sensor based on 4,4′,4″,4′″-tetra-tert-butylphthalocyanine cobalt(II)

Abstract

The potentiometric response characteristics of a pressed pellet solid-state membrane electrode based on 4,4′,4″,4′″-tetra-tert-butylphthalocyanine cobalt(II) were studied. The electrode exhibits a reversible potentiometric response towards ascorbic acid in the range 2 × 10^–6–1 × 10^–3 mol l^–1 with a slope of about –100 mV decade^–1. The electrode can also be used for the determination of cysteine. The response mechanism of the electrode was investigated with respect to a reversible oxidation–reduction process.