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Spectrophotometric determination of tungsten in rocks by an isotope dilution procedure

August 1, 1973

Samples are decomposed with hydrofluoric acid and perchloric acid in the presence of W181 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 W181.

Citation Information

Publication Year 1973
Title Spectrophotometric determination of tungsten in rocks by an isotope dilution procedure
DOI
Authors E.G. Lillie, L. Paul Greenland
Publication Type Article
Publication Subtype Journal Article
Series Title Journal of Research of the U.S. Geological Survey
Series Number
Index ID 70161892
Record Source USGS Publications Warehouse
USGS Organization