Mg Isotope Interlaboratory Comparison of Reference Materials from Earth-Surface Low-Temperature Environments

Netta Shalev, Juraj Farkaš, Jan Fietzke, Martin Novák, Jan A. Schuessler, Philip A.E. Pogge von Strandmann, Philip B. Törber
2018 Geostandards and Geoanalytical Research  
General rights This document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: To enable quality control of measurement procedures for determinations of Mg isotope amount ratios, expressed as d 26 Mg and d 25 Mg values, in Earth-surface studies, the d 26 Mg and d 25 Mg values of eight reference materials (RMs) were determined by interlaboratory comparison between five laboratories and
more » ... ering published data, if available. These matrix RMs, including river water SLRS-5, spring water NIST SRM 1640a, Dead Sea brine DSW-1, dolomites JDo-1 and BCS-CRM 512, limestone BCS-CRM 513, soil NIST SRM 2709a and vegetation NIST SRM 1515, are representative of a wide range of Earth-surface materials from low-temperature environments. The interlaboratory variability, 2s (twice the standard deviation), of all eight RMs ranges from 0.05 to 0.17‰ in d 26 Mg. Thus, it is suggested that all these materials are suitable for validation of d 26 Mg and d 25 Mg determinations in Earth-surface geochemical studies. Magnesium is a major element of the silicate Earth and vital in biogeochemical cycling. It has three stable isotopes: 24 Mg (78.99%), 25 Mg (10.00%) and 26 Mg (11.01%). Vol. 42 -N°2 0 6 1 8 P . 2 0 5 -2 2 1 2 0 5
doi:10.1111/ggr.12208 fatcat:bhd33oc445foxlpeemxe4ecpz4