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Sulphite was determined in alcoholic (wine) and non-alcoholic (fruit juice) samples using an indirect amperometric FIA method. The current measured at 0V was proportional to the amount of the Cu3+ species chemically generated by the sulphite-induced autoxidation of the Cu3+ /tetraglycine complex in the presence of traces of Ni2+. The proposed flow method incorporates gas-diffusion separation of sulphite...
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