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• W1980270498 abstract "In this contribution, we present a new technique for the ultra-precise determination of titanium stable isotope composition (expressed as δ49Ti or deviation of the 49Ti/47Ti ratio to the reference standard) of geological samples by multi-collection plasma source mass spectrometry (MC-ICPMS) using the double spike method to correct for instrumental mass bias. Tails of polyatomic spectral interferences on 46Ti are accounted for by using sample-standard bracketing in high-resolution mode. Choice of ideal double and triple spike composition is investigated and results show that analytical error for a single measurement is optimised for a 47Ti–49Ti double spike composed of ca. 50% of each spike and mixed with ca. 52% of sample. Measurements of pure Ti solution show that internal error on single measurements of ca. 0.010‰ (95% c.i.) is attainable on δ49Ti, in agreement with the error model. Due to the lack of a widely available reference isotopic standard for titanium, all results are expressed as deviations relative to newly created reference material (OL-Ti standing for Origins Laboratory – titanium) prepared from an ultra-pure titanium metal rod. A range of analytical tests demonstrates the robustness of our method. An external reproducibility of ca. 0.020‰ (2sd) is routinely achievable for Ti stable isotopes. Data for a range of basaltic rock standards as well as a subduction zone basalt reference suite is presented and show that the Ti stable isotope compositions of terrestrial basalt show resolvable variations but are overall very close to the OL-Ti reference standard. The average Ti isotopic composition of the basalts studied here is the present best estimate of the upper mantle composition; δ49Ti = +0.004 ± 0.062‰ (2sd)." @default.
• W1980270498 created "2016-06-24" @default.
• W1980270498 creator A5005526748 @default.
• W1980270498 creator A5076018403 @default.
• W1980270498 date "2014-06-12" @default.
• W1980270498 modified "2023-10-03" @default.
• W1980270498 title "Ultra-precise titanium stable isotope measurements by double-spike high resolution MC-ICP-MS" @default.
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• W1980270498 doi "https://doi.org/10.1039/c4ja00096j" @default.
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