Abstract
The application of inductively coupled plasma sector field mass spectrometers (ICP-SFMS), inductively coupled plasma quadrupole mass spectrometers with hexapole collision cell (HEX-ICP-MS) and multiple collector ICP-MS (MC-ICP-MS) for the determination of isotopic composition of highly enriched 187 Os and osmium samples is described. Good agreement of isotopic abundance was found in the three applied methods. A precision (2RSD) of 0.21–0.001, 0.83–0.09 and 5.5–0.083% for osmium isotope ratios, depending on isotope abundance in an interlaboratory metallic osmium sample, was observed in MC-ICP-MS, ICP-SFMS and HEX-ICP-MS measurements, respectively. A (NH 4) 2OsCl 6 (specpure Johnson Matthey Chemicals, JMC) sample was also analyzed by the MC-ICP-MS. The measured osmium isotope composition of the metallic osmium and JMC sample corresponds to natural osmium known in literature, with 187 Os abundance of 2.3 at.%. 187 Os abundance in three highly enriched samples of not identified, but assumed to be from special geological Precambrian formation of Russian origin varied between 98.934 and 99.53%. In addition, the 186 Os / 192 Os , 188 Os / 192 Os , 189 Os / 192 Os and 190 Os / 192 Os isotope ratios in all three enriched samples were close to the natural isotopic composition. This may indicate radioactive decay of 187 Re to 187 Os in rhenium-rich osmium samples in which the original osmium with a low initial concentration was of natural isotopic composition.
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