Use of a manganese dioxide column in the flow enthalpimetric determination of hydrogen peroxide

A method for flow enthalpimetric determination of H 2O 2 is described. The method uses manganese dioxide to catalyse the decomposition of H 2O 2. The catalyst is stable enough to be used for at least 500 analyses. H 2O 2 in the concentration range 0.01–10m M is determined with coefficients of variation < 2%. The method has been used for determination of glucose in a non-alcoholic beverage and wines, with glucose oxidase as the peroxide-producing enzyme.