TY - CONF A1 - Vogl, Jochen T1 - Implementation of ISO Guide 34 into the quality management system of BAM N2 - Presentation of the BAM quality management System with focus on the ISO Guide 34 implementation. This presentation is one part of the re-evaluation of BAM carried out by the Technical Committee of EURAMET. T2 - TC-Q Meeting CY - Dublin, Ireland DA - 12.04.2017 KW - Quality system KW - Re-evaluation KW - Metrology in chemistry KW - EURAMET KW - CCQM PY - 2017 AN - OPUS4-40031 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Vogl, Jochen T1 - CCQM-P149 Statistical evaluation of results N2 - The results for CCQM-P149 "Purity Determination of high purity zinc" are displayed and three different statistical approaches for the calculation of the reference value are compared. T2 - CCQM IAWG Meeting CY - Paris, France DA - 24.04.2017 KW - Purity KW - Metrology KW - Comparison KW - Impurities PY - 2017 AN - OPUS4-40033 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Vogl, Jochen T1 - Roadmap for the purity determination of pure metallic elements N2 - High purity materials can serve as a realisation of the Système International d’Unitès (SI) unit amount of substance for the specific element. Solutions prepared from such high purity materials using gravimetric preparation and the concept of molar mass are used as calibration solutions in many fields of analytical chemistry. Calibration solutions prepared this way provide the traceability to the SI and are the metrological basis in elemental analysis. The preparation and characterization of such primary pure substances, representing the realisation of the SI unit amount of substance, is undertaken only by a small number of National Metrology Institutes (NMI) and Designated Institutes (DI). Many other NMIs and DIs, however, prepare elemental calibration solutions as calibrants for their measurement services, such as the certification of matrix Reference Materials or the provision of reference values for Proficiency Testing schemes. The elemental calibration solutions used for this purpose are not a direct service to customers, such as preparing secondary calibration solutions, but provide the source of traceability for the other services. Hence, it is necessary for the NMI or DI to obtain data on the purity of the pure metals or other materials used to prepare the solutions with measurement uncertainties meeting the needs of the above described services. This is commonly undertaken as a “fit for purpose” assessment, appropriate for the uncertainty requirement of the service provided to customers. As a consequence, total purity measurements are a long-term strategy of CCQM-IAWG. Several studies were conducted (CCQM-P107, CCQM-K72 and CCQM-P149) on the measurement of the purity of zinc. From these studies, several conclusions can be drawn for the purity assessment of a pure (metallic) element. These conclusions will be put together in this document in order to assist all NMIs/DIs in performing a purity assessment, whenever needed. T2 - CCQM IAWG Meeting CY - Paris, France DA - 24.04.2017 KW - CCQM KW - Metrology KW - Purity assessment PY - 2017 AN - OPUS4-40034 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Vogl, Jochen T1 - Cu project on calibration approaches for absolute isotope ratios N2 - This presentations summarizes the difficulties in the purification of enriched copper isotopes by high vacuum subimation. It shows as well thelimitations for a CCQM key comparison on this topic. T2 - CCQM Isotope Ratio Work Group Meeting CY - Bern, Switzerland DA - 09.10.2019 KW - Absolute isotope ratio KW - Isotope purification KW - Metal sublimation KW - Gravimtric isotope mixtures PY - 2019 AN - OPUS4-49518 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Vogl, Jochen T1 - Isotope ratios and delta values with minimal measurement uncertainties -measuring magnesium using MC-ICP-MS N2 - Multi-collector inductively coupled plasma-mass spectrometry (MC-ICP-MS) has evolved significantly since its introduction in 1992. The second and third generation instruments now allow isotope ratio measurements at unprecedented precisions, 0.001 % or better. However, precision alone is not enough for producing accurate and reliable isotope ratio measurements. Metrological considerations such as the selection of suitable calibration strategies, proper assessment of instrumental biases, and the estimation of overall measurement uncertainty remain critical to the measurement process. Properly assessed, measurement uncertainty then provides the interval within which a result can be considered both accurate and precise. All mass spectrometric measurements are affected by instrumental mass discrimination and produce isotope ratios that are biased relative to their “true” ratio. To produce accurate and traceable isotope ratio measurements, it is imperative that certified isotope reference materials (iCRMs) be used for calibration and validation purposes. iCRMs reporting absolute isotope ratios are an analyst’s first choice, particularly when its uncertainty is sufficient for the intended use. However, when smaller uncertainties are required to resolve subtle differences between samples, delta-scale measurements become important. Here, the difference between an isotope ratio measured in a sample and in an internationally accepted isotope reference material (iRM) is determined. This deviation can be positive or negative relative to the iRM, is called a delta value, and is often expressed in per mil units. This presentation will highlight the potential for MC-ICP-MS to produce isotope ratio measurements with minimal uncertainties by examining three applications involving Mg isotopes: 1) the certification of a set of iCRMs for their absolute isotope ratio using a gravimetric isotope mixture approach; 2) the comparison of these iCRMs with currently accepted Mg delta-scale reference materials through intercalibration, and 3) the determination of isotope fractionation exponents for geochemical applications. T2 - 4th International Conference on Frontiers in Mass Spectrometry CY - Kottayam, Kerala, India DA - 04.12.2019 KW - Triple isotope fractionation KW - Absolute isotope ratio KW - Delta value KW - Mangesium PY - 2019 N1 - Geburtsname von Mieller, Björn: Brandt, B. - Birth name of Mieller, Björn: Brandt, B. AN - OPUS4-50004 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -