In situ ⁸⁷Rb–⁸⁷Sr analyses of terrestrial and extraterrestrial samples by LA-MC-ICP-MS/MS with double Wien filter and collision cell technologies

Abstract

Double-Wien filter-selection-aperture and hexapole-collision-cell technologies coupled to laser ablation multicollector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS/MS) enables in situ analysis of 87Sr variations produced by 87Rb decay.

A natural calcite reference material for microbeam Sr isotope analysis

“…In addition to the correction of isobaric interferences (Rb and Kr), 9,17–20 doubly charged rare earth elements (Yb 2+ and Er 2+ ) 15,21–24 and using a reactive gas in a collision/reaction cell (CRC) to allow Sr + to react but not Rb + , 25–28 a matrix-matched reference material is essential to reduce element fractionation and obtain high-quality Sr isotopic ratios during in situ Sr isotope analyses. The drift of 87 Sr/ 86 Sr ratios determined from reference values has been observed in previous studies, even though the samples have high Sr contents and low Rb/Sr ratios.…”

“…[9][10][11][12] Compared with the solution nebulizer (SN)-MC-ICP-MS technique which requires complex and time-consuming sample preparation, the microbeam analytical technique, notably the laser ablation (LA)-MC-ICP-MS with high sensitivity and spatial resolution, has been widely used to obtain the grain-or subgrain-scale Sr isotopic ratios. 9,[12][13][14][15][16] In addition to the correction of isobaric interferences (Rb and Kr), 9,[17][18][19][20] doubly charged rare earth elements (Yb 2+ and Er 2+ ) 15,[21][22][23][24] and using a reactive gas in a collision/reaction cell (CRC) to allow Sr + to react but not Rb + , [25][26][27][28] a matrix-matched reference material is essential to reduce element fractionation and obtain high-quality Sr isotopic ratios during in situ Sr isotope analyses. The dri of 87 Sr/ 86 Sr ratios determined from reference values has been observed in previous studies, even though the samples have high Sr contents and low Rb/Sr ratios.…”

“…10,[29][30][31] This large dri may have been caused by different elemental fractionations between Rb and Sr, so further calibration is required. 31 Dauphas et al 25 used a double Wien mass lter combined with uorination in a hexapole collision/ reaction cell to obtain accurate 87 Sr/ 86 Sr ratios in several standards with high Rb/Sr ratios. For carbonate samples, Vroon et al 10 found that all the 87 Sr/ 86 Sr ratios determined by LA-MC-ICP-MS were higher than those obtained by TIMS and SN-MC-ICP-MS.…”

Performance of the double-Wien filter of the Neoma MC-ICPMS/MS with an application to copper stable isotope compositions

“…[44][45][46] Lack of sensitivity and non-reproducible mass bias prevented the Proteus from being widely adopted by the MC-ICPMS community, and the low-energy quadrupole was replaced by a highenergy double Wien lter on the Vienna prototype. 47,48 The double-focusing electrostatic analyzer and magnetic sector geometry is standard and inspired from that of the Neptune MC-ICPMS, while the collection system has been totally redesigned as described in Dauphas et al 49 and Télouk et al 50 In this study, we rst explore the performance of the double-Wien lter to on-line prelter ions with different m/z using various combinations of B and S values. Second, we compare the performances of the Neoma MC-ICPMS/MS to those of standard MC-ICPMS and third, we measure the 65 Cu/ 63 Cu ratio in certied reference materials that have experienced a single purication step to validate the overall procedure.…”

“…The double-focusing electrostatic analyzer and magnetic sector geometry is standard and inspired from that of the Neptune MC-ICPMS, while the collection system has been totally redesigned as described in Dauphas et al 49 and Télouk et al 50…”