Precise and accurate 186Os/188Os and 187Os/188Os measurements by multi-collector plasma ionization mass spectrometry (MC-ICP-MS); Part I, Solution analyses

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doi: 10.1016/j.chemgeo.2007.10.020
Authors:Nowell, Geoff M.; Luguet, Ambre; Pearson, D. Graham; Horstwood, M. S. A.
Author Affiliations:Primary:
University of Durham, Arthur Holmes Isotope Geology Laboratory, Durham, United Kingdom
Other:
Montanunniversität Leoben, Austria
University of Toronto, Canada
NERC Isotope Geosciences Laboratory, United Kingdom
Volume Title:Highly siderophile element geochemistry
Volume Authors:Pearson, Graham D., editor; Selby, David; Meisel, Thomas; Brenan, James M.
Source:Highly siderophile element geochemistry, edited by Graham D. Pearson, Ambre Luguet, David Selby, Thomas Meisel and James M. Brenan. Chemical Geology, 248(3-4), p.363-393. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0009-2541
Publication Date:2008
Note:In English. 51 refs.; illus., incl. 8 tables
Summary:We present new high precision Os isotope data obtained by solution-mode MC-ICP-MS for 4 different Os isotope reference materials and compare the data to that obtained by the N-TIMS method. Mass fractionation effects for MC-ICP-MS are evaluated and we demonstrate excellent adherence to the exponential law. An improved and robust method for the derivation of interfering element isotope ratios is presented and evaluated via analysis of solutions with widely varying interfering element/analyte ratios. We show experiments that illustrate the extent of memory with a conventional solution introduction system and establish a protocol that reduces washout time and memory effects to the same level as those common for other elements typically analysed at high precision by MC-ICP-MS. Data for 4 Os Reference material solutions show excellent agreement between MC-ICP-MS and N-TIMS for all Os isotope ratios except 186Os/188Os and 184Os/188Os which are consistently lower by ∼100 ppm and 3-5 ppm respectively for MC-ICP-MS. These differences are highly unlikely to arise from problems relating to Faraday cup or amplifier efficiency variations, residual mass fractionation effects or inaccuracies in the applied W interference corrections on 186Os and 184Os for MC-ICP-MS analyses. These issues require further investigation if the Pt-Os system is to find routine application as a geochemical tracer. Abstract Copyright (2008) Elsevier, B.V. [D.J.M.]
Sections:Apparatus and techniques; Geochemistry
Subsections:Analytical geochemistry
Subjects:Accuracy; Corrections; Geochemistry; ICP mass spectra; Isotope fractionation; Isotope ratios; Isotopes; Mass spectra; Measurement; Metals; Os-188/Os-187; Osmium; Platinum group; Precision; Rhenium; Siderophile elements; Spectra; Stable isotopes; Techniques; Thermal ionization mass spectra; Os-186; Os-187; Os-188
Abstract Numbers:08M/1373
Record ID:2008109925
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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