26 research outputs found
Mg isotope inter-laboratory comparison of reference materials from earth-surface low-temperature environments
To enable quality control of measurement procedures for determinations of Mg isotope amount ratios, expressed as δ26Mg and δ25Mg values, in Earthâsurface studies, the δ26Mg and δ25Mg values of eight reference materials (RMs) were determined by interâlaboratory comparison between five laboratories and considering published data, if available. These matrix RMs, including river water SLRSâ5, spring water NIST SRM 1640a, Dead Sea brine DSWâ1, dolomites JDoâ1 and CRM 512, limestone CRM 513, soil NIST SRM 2709a and vegetation NIST SRM 1515 apple leaves, are representative for a wide range of Earthâsurface materials from lowâtemperature environments. The interâlaboratory variability, 2s (twice the standard deviation), of all eight RMs ranges from 0.05 to 0.17â° in δ26Mg. Thus, it is suggested that all these materials are suitable for validation of δ26Mg and δ25Mg determinations of Earthâsurface geochemical studies