Effective methods are described for the chemical separation of rhenium, osmium and molybdenum. The methods are based on distillation and anion-exchange chromatography, and have been the basis for rhenium-osmium isotope studies of ore deposits and meteorites. Successful anion-exchange separation of osmium requires both recognition and careful control of the osmium species in solution; thus, distillation of osmium tetroxide from a mixture of sulfuric acid and hydrogen peroxide is preferred to anion-exchange. Distribution coefficients measured for perrhenate in sulfuric acid media are sufficiently high (Kd > 500) for rhenium to be directly loaded onto an ion-exchange column from a distillation residue and subsequently eluted with nitric acid. Polymerization of molybdenum species during elution is prevented by use of a solution that is 1M in hydrochloric acid and 1M in sodium chloride. ?? 1991.
Citation Information
Publication Year | 1991 |
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Title | Methods for the separation of rhenium, osmium and molybdenum applicable to isotope geochemistry |
Authors | J. W. Morgan, D.W. Golightly, A.F. Dorrzapf |
Publication Type | Article |
Publication Subtype | Journal Article |
Series Title | Talanta |
Index ID | 70016943 |
Record Source | USGS Publications Warehouse |