TY  - JOUR
A1  - Vogl, Jochen
A1  - Rosner, Martin
A1  - Kasemann, Simone A.
A1  - Kraft, Rebecca
A1  - Meixner, Anette
A1  - Noordmann, Janine
A1  - Rabb, Savelas
A1  - Rienitz, Olaf
A1  - Schuessler, Jan A.
A1  - Tatzel, Michael
A1  - Vocke, Robert D.
T1  - Intercalibration of Mg Isotope Delta Scales and Realisation of SI Traceability for Mg Isotope Amount Ratios and Isotope Delta Values
Y1  - 2020
VL  - 44
IS  - 3
SP  - 439
EP  - 457
JF  - Geostandards and Geoanalytical Research
DO  - 10.1111/ggr.12327
DO  - 10.23689/fidgeo-5118
N2  - 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 δ25/24Mg values and less than 0.037‰ for the δ26/24Mg 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 θapp, the fractionation relationship ln α(25/24Mg)/ln α(26/24Mg).
UR  - http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9464
ER  -