Barium Isotopic Compositions in Thirty‐Four Geological Reference Materials Analysed by MC‐ICP‐MS,Geostandards and Geoanalytical Research

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Barium Isotopic Compositions in Thirty‐Four Geological Reference Materials Analysed by MC‐ICP‐MS
Geostandards and Geoanalytical Research ( IF 2.7 ) Pub Date : 2019-11-13 , DOI: 10.1111/ggr.12299
Ya‐Jun An ₁ , Xin Li ₁ , Zhao‐Feng Zhang ₁

Affiliation

Measurement of Ba isotope ratios of widely available reference materials is required for interlaboratory comparison of data. Here, we present new Ba isotope data for thirty‐four geological reference materials, including silicates, carbonates, river/marine sediments and soils. These reference materials (RMs) cover a wide range of compositions, with Ba mass fractions ranging from 6.4 to 1900 µg g⁻¹, SiO₂ from 0.62% to 90.36% m/m and MgO from 0.08% to 41.03% m/m. Accuracy and precision of our data were assessed by the analyses of duplicate samples and USGS rock RMs. Barium isotopic compositions for all RMs were in agreement with each other within uncertainty. The variation of δ^138/134Ba in these RMs was up to 0.7‰. The shale reference sample, affected by a high degree of chemical weathering, had the highest δ^138/134Ba (0.37 ± 0.03‰), while the stream sediment obtained from a tributary draining carbonate rocks was characterised by the lowest δ^138/134Ba (−0.30 ± 0.05‰). Geochemical RMs play a fundamental role in the high‐precision and accurate determination of Ba isotopic compositions for natural samples with similar matrices. Analyses of these RMs could provide universal comparability for Ba isotope data and enable assessment of accuracy for interlaboratory data.

中文翻译：

MC‐ICP‐MS分析的34种地质参考物质中的钡同位素组成

对于实验室间的数据比较，需要测量广泛使用的参考材料的钡同位素比。在这里，我们提供了34种地质参考物质的新钡同位素数据，包括硅酸盐，碳酸盐，河流/海洋沉积物和土壤。这些参考材料（RMs）涵盖了广泛的组成，Ba的质量分数范围为6.4至1900 µg g ^-1，SiO _2的范围为0.62％至90.36％m / m，MgO的范围为0.08％至41.03％m / m。通过对重复样本和USGS岩石RM进行分析，评估了我们数据的准确性和准确性。在不确定性范围内，所有RM的钡同位素组成彼此一致。δ的变化这些RM中的^138/134 Ba高达0.7‰。受高度化学风化影响的页岩参考样品具有最高的^δ138/134 Ba（0.37±0.03‰），而从支流排水碳酸盐岩获得的流沉积物的特征在于最低的^δ138/134 Ba （-0.30±0.05‰）。地球化学RM在高精度和准确测定具有相似基质的天然样品中的Ba同位素组成中起着基本作用。这些RM的分析可以为Ba同位素数据提供通用的可比性，并可以评估实验室间数据的准确性。

更新日期：2019-11-13

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