131508 20240209155916.0 doi 10.1039/c5ja00157a sideral 93139 ART-2016-93139 eng Bolea-Fernandez, E. (orcid)0000-0002-1856-2058 Tandem ICP-mass spectrometry for Sr isotopic analysis without prior Rb/Sr separation 2016 The use of a mixture of 10% of CH3F and 90% of He as a reaction gas in tandem ICP-mass spectrometry (ICP-MS/MS) enables the accurate determination of the 87Sr/86Sr isotope ratio in geological materials, provided that mass discrimination is corrected for by using a combination of internal (Russell law, assuming a constant 88Sr/86Sr isotope ratio) and external correction (using the isotopic reference material NIST SRM 987 SrCO3) in a sample-standard bracketing approach. No prior Rb/Sr separation is required as the isobaric overlap at a mass-to-charge ratio of 87 is avoided by monitoring SrF+ reaction product ions instead of Sr+ ions. Rb shows no reactivity towards CH3F. The double mass selection (MS/MS mode) prevents both spectral overlap from atomic ions at the mass-to-charge ratios of SrF+ reaction product ions and a measurable effect from the matrix on the 87Sr/86Sr result. This aspect is critical, as it enables accurate results to be obtained without the need for using a matrix-matched standard to correct for mass discrimination, in contrast to previous work with a quadrupole ICP-MS instrument with a CH3F/Ne-pressurized cell, in which the use of a matrix-matched standard was compulsory. The precision attainable-0.05% RSD external precision-suffices for making the newly developed method useful in a variety of applications. Access copy available to the general public Unrestricted info:eu-repo/grantAgreement/ES/MINECO/CTQ2012-33494 info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 3.379 2016 SPECTROSCOPY 6 / 41 = 0.146 2016 Q1 T1 CHEMISTRY, ANALYTICAL 17 / 76 = 0.224 2016 Q1 T1 1.004 2016 Spectroscopy 2016 Q1 Analytical Chemistry 2016 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Balcaen, L. Resano, M. Universidad de Zaragoza (orcid)0000-0002-7450-8769 Vanhaecke, F. 2009 750 Universidad de Zaragoza Dpto. Química Analítica Área Química Analítica 31, 1 (2016), 303-310 J. anal. at. spectrom. Journal of Analytical Atomic Spectrometry 0267-9477 579056 http://zaguan.unizar.es/record/131508/files/texto_completo.pdf Postprint 1379875 http://zaguan.unizar.es/record/131508/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:131508 articulos driver 2024-02-09-14:32:29 ARTICLE