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Chemical Separation of Rhenium and Osmium (PGEs): Materials and Methods

B. Peucker-Ehrenbrink (12/14/1997)

This documentation is based on the developments by Luck (1982), Ravizza (1990), Esser (1991), Reisberg et al. (1991), Falkner (1992), Pegram et al. (1992), Ravizza and Pyle (1997), and Birck et al. (1997). Osmium isotope ratio determination by negative thermal ionization mass spectrometry, developed over the last decade by Heumann's group at the University of Regensburg Department of Inorganic Chemistry, is described by Völkening et al. (1991) and Creaser et al. (1991).

The analytical procedure outlined below is the standard technique used at the Woods Hole Oceanographic Institution (WHOI). Osmium isotope measurements are made on NIMA-B as described by Hauri (1992) and Hauri and Hart (1993).

1. MATERIALS

1.1......... Chemicals
1.2......... Resin
1.3......... Spikes
1.4......... Labware

2. METHODS

2.1......... Chemical Separation of Osmium
2.1.1..... Fire-assay
2.1.2..... Peroxide leach
2.1.3..... Distillation
2.1.4..... Single resin bead chemistry
2.1.5..... Microdistillation
2.1.6..... Loading the samples
2.2......... Complementary PGE
2.3......... Chemical Separation of Rhenium
2.3.1..... Dissolution
2.3.2..... Chemical separation

3. ACKNOWLEDGMENTS

4. REFERENCES