Precise and accurate 186Os/188Os and 187Os/188Os measurements by multi-collector plasma ionisation mass spectrometry (MC-ICP-MS) part I: Solution analyses

摘要: Abstract We present new high precision Os isotope data obtained by solution-mode MC-ICP-MS for 4 different reference materials and compare the to that N-TIMS method. Mass fractionation effects are evaluated we demonstrate excellent adherence exponential law. An improved robust method derivation of interfering element ratios is presented via analysis solutions with widely varying element/analyte ratios. show experiments illustrate extent memory a conventional solution introduction system establish protocol reduces washout time same level as those common other elements typically analysed at MC-ICP-MS. Data Reference material agreement between all except 186Os/188Os 184Os/188Os which consistently lower ∼ 100 ppm 3–5‰ respectively These differences highly unlikely arise from problems relating Faraday cup or amplifier efficiency variations, residual mass inaccuracies in applied W interference corrections on 186Os 184Os analyses. issues require further investigation if Pt–Os find routine application geochemical tracer.