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The electrochemical behaviour of four sulphonylureas (chlorsulfuron, metsulfuron methyl, DPX-M6316 and chlorimuron ethyl) used as active compounds in commercial herbicides was studied. Methanolwater solutions of the compounds were analysed by differential-pulse polarography. The dependence of peak potentials and peak height on the pH is reported. Detection limits of the order of 10-*M were obtained, working at a pH of between 2 and 3. Attempts to use a mercury-coated glassy carbon electrode, in view of the possible applications to high-performance liquid chromatography with electrochemical detection, gave unsatisfactory results due to the interference from hydrogen ion reduction.

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