Despite its widespread applications in geology, all osmium isotope ratio measurements are either uncalibrated or rely on the veracity of the uncalibrated 1937 Nier values by adopting them as normalizing constants typically in conjunction with an exponential mass bias correction model. In this study, isotope ratios of osmium were determined in six commercial osmium materials, including the DROsS standard and a new NRC isotopic osmium reference material OSIS-1, by MC-ICPMS. We use a previously optimized and validated regression mass bias correction model to correct instrumental isotope fractionation effects which does not rely either on Nier’s values or on a strictly mass-dependent behavior of the isotopes. Deviations from mass-dependent fractionation (mass independent fractionation) were observed for osmium isotopes in MC-ICPMS with the most dramatic effect occurring for ¹⁸⁷Os, wherein, on average, close to half-percent bias in the isotope ratio ¹⁸⁷Os/¹⁸⁸Os was observed as a result of imposing Russell’s law.

中文翻译：

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使用MC-ICPMS测定the的同位素组成

尽管其在地质学中的广泛应用，但所有all同位素比率的测量要么未经校准，要么依赖于未经校准的1937 Nier值的准确性，通常将其用作归一化常数，通常与指数质量偏差校正模型结合使用。在这项研究中，通过MC-ICPMS测定了六种商业材料（包括DROsS标准品和新的NRC同位素参考材料OSIS-1）中of的同位素比。我们使用先前优化和验证的回归质量偏差校正模型来校正仪器同位素分馏效应，该效应既不依赖于Nier值也不依赖于同位素的严格质量相关行为。^187级的OS，其特征在于，平均来说，接近同位素比率半百分比偏差^187和OS / ¹⁸⁸，观察到O的作为强行罗素定律的结果。