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Initial tests performed by solution analysis guided the development of the LA-ICP-MS/MS-based protocol.
Analysis of pressed particulate pellets of natural molybdenite was used to assess the protocol with respect to detection limits and precision and accuracy of Re-Os ratios.
The first two analytical runs were focused on the analysis of pressed pellets with a 110 μm spot size to evaluate reproducibility within runs and between runs and to evaluate age precision and accuracy.
In the third run, a range of molybdenite crystals were targeted using 70 μm spot size, in order to evaluate the protocol on natural materials.
With the introduction of ICP tandem mass spectrometry (MS/MS), it has become possible to control a range of isobaric interferences previously out of reach of quadrupole ICP-MS (Bolea-Fernandez et al. Effective separation is possible because the daughter isotope reacts with a reaction gas and is measured in the so-called mass-shift mode, while the parent isotope does not react and is measured on-mass.