Rhenium concentration in Australian molybdenites by stable isotope dilution

A method for the determination of rhenium in molybdenite is described for concentrations down to 10 −7 null g/g. Separation of microgram quantities of rhenium from molybdenite is effected by a pyridine solvent extraction and the rhenium concentration determined by stable isotope dilution. null Rhenium determinations were made on molybdenite specimens sampled at various localities throughout the Australian continent. Their rhenium concentration...