TY - CONF A1 - Rosner, Martin T1 - Intercomparison of delta26Mg Values in Mg Isotope RMs and Standards N2 - Accurate measurements of stable isotope abundance ratio variations are often reported using artifact based delta-scales, which rely on suitable isotopic reference materials (iRM) for their realization. For example, variations in the 26Mg/24Mg isotope abundance ratio in natural systems are typically reported as delta26Mg values that represents the relative difference between the 26Mg/24Mg ratio measured in a sample relative to its measurement preferably in an iRM. In the past, such delta26Mg measurements were referenced to NIST SRM 980, the initial zero of the delta26Mg scale. With the development of MC-ICPMS, the detection of small but measurable isotopic differences in different chips of SRM 980 became apparent. It was then replaced by a Mg solution (DSM3), the new zero of the delta26Mg scale. A potential replacement iRM for DSM3 has been developed, ERM-AE143. This iRM has also been measured for its absolute isotope amount ratios1,2 making it traceable to the SI. The results of an delta26Mg intercomparison experiment include the Mg iRMs SRM 980, IRMM-009, ERM-AE143, AE144, AE145 standards DSM3 and Cambridge-1. The intercomparison involved 5 expert laboratories, consisting of 3 national metrological institutes (BAM, NIST, PTB) and 2 scientific research laboratories (GFZ Potsdam, UBremen). The iRMs were measured relative to AE143 and cover a range of ≈5 ‰ in delta26Mg. IRMM-009 has the lowest delta26Mg value while DSM3 has the highest, spanning a range in values that covers natural Mg isotope variations. The 2SD reproducibilities of the individual values from the different laboratories range from 0.02 to 0.26 ‰. The mean delta26Mg values, calculated from the laboratory means however show 2SD reproducibilities varing between 0.025 and 0.093 ‰. Propagated measurement uncertainties suggest a standard uncertainty of about 0.1‰ for delta26Mg determinations. T2 - Goldschmidt 2017 CY - Paris, France DA - 13.08.2017 KW - Magnesium delta value KW - Isotope reference material KW - Intercalibration KW - Magnesium isotope ratio PY - 2017 AN - OPUS4-44639 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rosner, Martin T1 - Authentication of bell peppers using boron and strontium isotope compositions T2 - European Geosciences Union, General Assembly 2010 CY - Vienna, Austria DA - 2010-05-02 PY - 2010 AN - OPUS4-21541 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rosner, Martin T1 - Boron isotopes - a new tracer for the origin and authenticity of food T2 - DGMS-Jahrestagung CY - Konstanz, Germany DA - 2009-03-08 PY - 2009 AN - OPUS4-19134 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rosner, Martin T1 - Boron isotope compositions of crop plants: A new tracer for the origin and authenticity of food T2 - TRACE 5th annual meeting and conference - TRACE in practice CY - Freising, Germany DA - 2009-04-01 PY - 2009 AN - OPUS4-20643 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rosner, Martin T1 - Three new offset delta 11 B isotope reference materials for environmental boron isotope studies T2 - IAEA 2011 - "International Symposium on Isotopes in Hydrology, Marine Ecosystems, and Climate Change Studies" CY - Monaco DA - 2011-03-27 PY - 2011 AN - OPUS4-23815 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rosner, Martin T1 - New offset delta 11 B isotope reference materials for geochemical and environmental boron isotope studies T2 - Goldschmidt Tagung 2011 CY - Prague, Czech Republic DA - 2011-08-14 PY - 2011 AN - OPUS4-23817 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -