The continuous improvement of analytical procedures using multi‐collector technologies in ICP‐mass spectrometry has led to an increased demand for isotope standards with improved homogeneity and reduced measurement uncertainty. For magnesium, this has led to a variety of available standards with different quality levels ranging from artefact standards to isotope reference materials certified for absolute isotope ratios. This required an intercalibration of all standards and reference materials, which we present in this interlaboratory comparison study. The materials Cambridge1, DSM3, ERM‐AE143, ERM‐AE144, ERM‐AE145, IRMM‐009 and NIST SRM 980 were cross‐calibrated with expanded measurement uncertainties (95% confidence level) of less than 0.030‰ for the δ^25/24Mg values and less than 0.037‰ for the δ^26/24Mg values. Thus, comparability of all magnesium isotope delta (δ) measurements based on these standards and reference materials is established. Further, ERM‐AE143 anchors all magnesium δ‐scales to absolute isotope ratios and therefore establishes SI traceability, here traceability to the SI base unit mole. This applies especially to the DSM3 scale, which is proposed to be maintained. With ERM‐AE144 and ERM‐AE145, which are product and educt of a sublimation–condensation process, for the first time a set of isotope reference materials is available with a published value for the apparent triple isotope fractionation exponent θ_app, the fractionation relationship ln α(^25/24Mg)/ln α(^26/24Mg).

中文翻译：

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镁同位素量表的标定和镁同位素量比和同位素值的SI可追溯性

ICP-质谱中使用多收集器技术的分析程序的不断改进，导致对同位素标准品的需求增加，同时提高了均一性并降低了测量不确定度。对于镁，这导致了各种可用质量标准不同的可用标准，从人工制品标准到经过绝对同位素比认证的同位素参考材料。这需要对所有标准品和参考材料进行相互校准，我们将在此实验室间的比较研究中对它们​​进行校准。材料Cambridge1，DSM3，ERM-AE143，ERM-AE144，ERM-AE145，IRMM-009和NIST SRM 980被交叉校准小于0.030膨胀测量的不确定性（95％置信水平）‰的δ ^25/24 Mg值且δ小于0.037‰^26/24 Mg值。因此，建立了基于这些标准品和参考材料的所有镁同位素δ（δ）测量值的可比性。此外，ERM-AE143将所有镁δ尺度锚定到绝对同位素比，因此建立了SI的可追溯性，此处可追溯到SI的基本单位摩尔。这尤其适用于拟维护的DSM3量表。与ERM-AE144和ERM-AE145，这是升华缩合过程的产物和离析物，首次一组同位素参考材料可与用于表观三重同位素分馏指数θ发布的值_应用，分馏关系^lnα（^25/24 Mg）/ ^lnα（^26/24 Mg）。