Abstract
Methods for ruthenium isotope measurement by both positive and negative ion thermal ionization mass spectrometry (PTI-MS and NTI-MS, respectively) are studied in this work. We found that Ru isotopes 100 and 104 are subjected to isobaric interferences from the silica gel used to improve sensitivity in PTI-MS. Measurement of ruthenium isotopes by NTI-MS is discussed here. The method is proved to be sensitive and free from the isobaric interferences. With precise isotope ratios of several ruthenium reagents measured by NTI-MS, we calculated the atomic weight of ruthenium to be 101.064 98 ± 0.000 16 (2σ), which is much more accurate than the data of 101.07 ± 0.02 currently suggested by IUPAC.
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