Molybdenum Mass Fractions and Isotopic Compositions of International Geological Reference Materials

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• 作者：Pei-Pei Zhao ; Jie Li ; Le Zhang ; Zhi-Bing Wang ; De-Xin Kong ; Jin-Long Ma ; Gang-Jian Wei and Ji-Feng Xu
• 刊名：Geostandards and Geoanalytical Research
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：40
• 期：2
• 页码：217-226
• 全文大小：621K
• ISSN：1751-908X

文摘

The double-spike method with multi-collector inductively coupled plasma-mass spectrometry was used to measure the Mo mass fractions and isotopic compositions of a set of geological reference materials including the mineral molybdenite, seawater, coral, as well as igneous and sedimentary rocks. The long-term reproducibility of the Mo isotopic measurements, based on two-year analyses of NIST SRM 3134 reference solutions and seawater samples, was ≤ 0.07‰ (two standard deviations, 2s, n = 167) for δ^98/95Mo. Accuracy was evaluated by analyses of Atlantic seawater, which yielded a mean δ^98/95Mo of 2.03 ± 0.06‰ (2s, n = 30, relative to NIST SRM 3134 = 0‰) and mass fraction of 0.0104 ± 0.0006 μg g⁻¹ (2s, n = 30), which is indistinguishable from seawater samples taken world-wide and measured in other laboratories. The comprehensive data set presented in this study serves as a reference for quality assurance and interlaboratory comparison of high-precision Mo mass fractions and isotopic compositions.