Determination of microgram quantities of tungsten in iron, molybdenum and titanium by X-ray fluorescence analysis

A method for the determination of microgram quantities of tungsten in iron, molybdenum and titanium by X-ray fluorescence analysis was given, in which tungsten was separated from the matrix metals by phenylfluorone with germanium as the coprecipitant after molybdenum and titanium had been masked respectively with EDTA and hydrogen peroxide. The precipitation was done most successfully in 1% sulfuric acid or hydrochloric acid, and the precipitate was collected on a membrane filter. The recommended method was more rapid and sensitive than other chemical and spectrographic methods.