Kinetic-spectrofluorimetric determination of nanogram levels of manganese in wines by the 2-hydroxynaphthaldehyde thiosemicarbazone-hydrogen peroxide system
Abstract
A kinetic method is described for the determination of nanogram amounts of manganese(II) based on its catalytic effect on the hydrogen peroxide oxidation of 2-hydroxynaphthaldehyde thiosemicarbazone. Several wine and brandy samples containing 130–550 µg l–1 and 42–140 µg l–1 of manganese, respectively, from some Spanish wine-growing areas have been analysed by this method without any previous ashing of the sample. The preparation and properties of the reagent and the kinetic parameters of the catalysed reaction are also reported.