The electrochemical properties of thiourea (TU) were investigated in pH range 2.0 -12.0 by cyclic and square-wave voltammetry. The compound was irreversibly oxidized at a pencil graphite electrode in one or two oxidation steps which are pH-dependent. Based on the voltammetric peak for the second oxidation process of TU in phosphate buffer at pH 12.0, a square-wave voltammetric method was proposed for the determination of the compound in the range 6.3 -30 µ m , with a detection limit of 1.29 µ m . The applicability to direct assays of wastewaters was also tested.
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