Barium Isotopic Compositions of Geological Reference Materials

van Zuilen, Kirsten; Nägler, Thomas; Bullen, Thomas D. (2016). Barium Isotopic Compositions of Geological Reference Materials. Geostandards and Geoanalytical Research, 40(4), pp. 543-558. Wiley 10.1111/ggr.12122

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The interest in variations of barium (Ba) stable isotope amount ratios in low and high temperature environments has increased over the past several years. Characterisa- tion of Ba isotope ratios of widely available reference materials is now required to validate analytical proce- dures and to allow comparison of data obtained by different laboratories. We present new Ba isotope amount ratio data for twelve geological reference materials with silicate (AGV-1, G-2, BHVO-1, QLO-1, BIR-1, JG-1a, JB- 1a, JR-1 and JA-1), carbonate (IAEA-CO-9) and sulfate matrices (IAEA-SO-5 and IAEA-SO-6) relative to NIST SRM 3104a. In addition, two artificially fractionated in-house reference materials BaBe12 and BaBe27 (d137/134Ba = -1.161 ± 0.049‰ and -0.616 ± 0.050‰, respectively) are used as quality control solutions for the negative d- range. Accuracy of our data was assessed by interlabo- ratory comparison between the University of Bern and the United States Geological Survey (USGS). Data were measured by MC-ICP-MS (Bern) and TIMS (USGS) using two different double spikes for mass bias correction (130Ba–135Ba and 132Ba–136Ba, respectively). MC-ICP- MS measurements were further tested for isobaric and non-spectral matrix effects by a number of common matrix elements. The results are in excellent agreement and suggest data accuracy.

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