Spectrophotometric determination of tungsten in rocks by an isotope dilution procedure

E.G. Lillie; L. Paul Greenland

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USGS · 70161892

Spectrophotometric determination of tungsten in rocks by an isotope dilution procedure

E.G. Lillie·L. Paul Greenland

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Abstract

Samples are decomposed with hydrofluoric acid and perchloric acid in the presence of W 181 tracer. Molybdenum is extracted from a hydrochloric acid solution with tributyl phosphate. Tungsten is separated from most other elements by extraction of the a-benzoinoximate into chloroform. Stannous chloride in concentrated hydrochloric acid is used to strip tungsten and reduce it to W +5 . The amount of tungsten is determined spectrophotometrically after extraction as the thiocyanate complex into amyl alcohol. The correction for chemical losses is determined by counting W 181 .

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E.G. Lillie, L. Paul Greenland. 1973. Spectrophotometric determination of tungsten in rocks by an isotope dilution procedure. https://pubs.usgs.gov/publication/70161892

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