Amperometric responses of hydrogen peroxide, ascorbate and paracetamol have been studied at platinum electrodes coated with Nafion or electropolymerized polypyrrole and poly(o-phenylenediamine) layers. Among the three layers studied, the Nafion layer shows superior properties. It possesses high permeability to hydrogen peroxide (95% as compared to naked platinum) and drastically diminishes responses from common interferences like ascorbate (up to 1–4%) and paracetamol (up to 46%). The electropolymerized poly(o-phenylenediamine) layer also shows good permeability to peroxide (90%), whereas its ability to repel ascorbate (up to 11–46%) does not appear to be as efficient as that of Nafion. The electropolymerized polypyrrole layer retards the permeability of peroxide and paracetamol up to 60% and increases the response to ascorbate by the factor of 1.9–2.6, probably due to its electrocatalytic action.

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