Abstract
Abstract Methods for the determination of traces of tungsten have been developed by directly subjecting the organic extracts of its benzo- and cinnamohydroxamic acid complexes to d. c. and derivative pulse polarography. Well defined waves and peaks are obtained in a ternary solvent mixture containing the extract, methanolic lithium chloride and aqueous phase. The methods are highly selective and allow determination of the metal in the ppm range. A procedure has also been developed for the simultaneous determination of tungsten and molybdenum using their benzohydroxamates. Effects of acids and solvents on the system have been studied and the probable mechanism of reduction of the complexes has also been discussed.
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