S. A. Wilson W. Abouchami M. Amini J. Chmeleff A. Eisenhauer E. Hegner L.M. Iaccheri B. Kieffer J. Krause W.F. McDonough R. Mertz-Kraus I. Raczek R.L. Rudnick Donna K. Scholz G. Steinhoefel B. Stoll A. Stracke S. Tonarini D. Weis U. Weis J.D. Woodhead K.P. Jochum 2011 This paper contains the results of an extensive isotopic study of United States Geological Survey GSD-1G and MPI-DING reference glasses. Thirteen different laboratories were involved using high-precision bulk (TIMS, MC-ICP-MS) and microanalytical (LA-MC-ICP-MS, LA-ICP-MS) techniques. Detailed studies were performed to demonstrate the large-scale and small-scale homogeneity of the reference glasses. Together with previously published isotopic data from ten other laboratories, preliminary reference and information values as well as their uncertainties at the 95% confidence level were determined for H, O, Li, B, Si, Ca, Sr, Nd, Hf, Pb, Th and U isotopes using the recommendations of the International Association of Geoanalysts for certification of reference materials. Our results indicate that GSD-1G and the MPI-DING glasses are suitable reference materials for microanalytical and bulk analytical purposes. Ce document contient les r??sultats d'une importante ??tude isotopique des verres de r??f??rence USGS GSD-1G et MPI-DING. Treize laboratoires diff??rents ont particip?? au travers de techniques analytiques de haute pr??cision travaillant soit sur ??chantillon total (TIMS, MC-ICP-MS) soit par microanalyse ??in situ?? (LA-MC-ICP-MS, LA-ICP-MS). ?? 2010 The Authors. Geostandards and Geoanalytical Research ?? 2010 International Association of Geoanalysts. application/pdf 10.1111/j.1751-908X.2010.00114.x en GSD-1G and MPI-DING Reference Glasses for In Situ and Bulk Isotopic Determination article