Metoprolol tartrate was electrolysed at 20°C in aqueous systems using mixed oxide and boron doped diamond anodes. Fast depletion was observed when chloride ions were components of the waters. Additional ions such as sulphate and nitrate decreased the oxidation rate. Higher chloride concentration and current densities up to 200 A m-2 accelerated metoprolol destruction. 4-(2-methoxyethyle)-phenol and 3-chloro-4-hydroxyphenyle acidic acid were identified as reaction by-products.

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