Amperometric sensor for thiosulphate based on cobalt hexacyanoferrate modified electrode

A chemically modified amperometric sensor was constructed by mechanically immobilizing cobalt hexacyanoferrate onto the surface of a paraffin impregnated graphite electrode (PIGE). The cyclic voltammogram of the electrode exhibited two reversible redox peaks corresponding to Co2+/Co3+ and Fe(CN)64−/Fe(CN)63− reactions. Thiosulphate was found to undergo electrocatalytic oxidation at a reduced overpotential with good sensitivity in a wider pH...