Electrocatalytic amperometric detection of hydroxylamine with a palladium‐modified carbon paste electrode

Abstract

Abstract Carbon paste electrodes (CPEs), modified by addition of Pd powder to the paste and electroactivation, exhibited electrocatalytic activity towards hydroxylamine. Electrogenerated palladium(0) at the electrode surface was found to be involved in the electrocatalytic oxidation of NH 2 OH. The electrode was employed as an amperometric detector for flow injection systems. Repeated injections (60) of hydroxylamine (5 ng) showed a relative standard deviation of 4.0%. Linear relation between the current and the analyte concentration was found between 0.1 and 10 ng of hydroxylamine. The detection limit was 20pg NH 2 OH (3σ). The applicability of the method to the determination of hydroxylamine in river water was investigated.