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. 2014 Dec 14;29(2):191–204. doi: 10.1002/rcm.7095

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© 2014 The Authors. Rapid Communications in Mass Spectrometry published by John Wiley & Sons, Ltd.

This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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Instrumental fractionation factors determined from GSD-1G analyses during two 16 h periods of our runs. Fractionation factors are expressed as the measured abundance ratios in the GSD-1G reference glass divided by their published abundance ratios.⁴⁸^,⁴⁹ Isotopic fractionations (upper panels) are close to unity, and exhibit slight variations. Elemental fractionations (lower panels) are more extreme (note the much greater vertical scale), and though sometimes they remain nearly constant (lower left panel), they sometimes exhibit ∼50% fluctuations (lower right panel). Error bars represent 1σ, and are often smaller than the plotted symbols.