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Eingeladener Vortrag
- nein (10)
Dieser Bericht beschreibt die Herstellung und Zertifizierung einer Cadmiumlösung mit natürlicher Isotopenzusammensetzung. Für das Isotopen-Referenzmaterial sind sowohl die Isotopenverhältnisse als auch Isotopenhäufigkeiten und die molare Masse von Cadmium zertifiziert. Die Unsicherheiten sind erweiterte Messunsicherheiten U = k.uc mit k = 2. Der Cadmium-Massenanteil in der Lösung wird als indikativer Wert angegeben mit einer erweiterten Messunsicherheit U = k.uc mit k = 4,5.
Isotope dilution mass spectrometry often is applied for the quantification of platinum group elements in environmental and geological samples. In most cases, however, certified spike solutions offering complete uncertainty statements and SI-traceability are missing. This report describes the production and certification of two isotope reference materials, ERM-AE140 and ERM-AE141, serving as calibrated spike solutions for IDMS based quantification of Pd and Pt, respectively. Both materials were produced by dissolving highly enriched isotopes 106Pd and 194Pt and determining the mass fraction of 106Pd and 194Pt in the final solution by reverse IDMS. Two independent back-spikes were produced for each material from high purity Pd and Pt. Characterization measurements were carried out by MC-ICPMS. For ERM-AE140 the certified mass fractions are w(106Pd) = 20.24(5) mg/kg and w(Pd) = 20.54(5) mg/kg. For ERM-AE141 the certified mass fractions are w(194Pt) = 18.18(11) mg/kg and w(Pt) = 19.90(12) mg/kg. These values are traceable to the International System of Units (SI) in the shortest possible way.
Isotope Ratio Measurements
(2015)
Determination of the Pb isotopic composition in medieval pilgrim badges - Micro samples of approximately 1 mg or less were obtained from the backside of 12medieval pilgrim badges. After cleaning with water in an ultrasonic bath the samples were dissolved and the Pb was separated by chromtographic means. In the isolated Pb fractions the Pb isotope ratios were determined by thermal ionization mass spectrometry with expanded measurement uncertainties of less than 0.1 %. The determined Pb isotopic composition of the pilgrim badges spread over the whole range of the European and Mediterranean ore deposits. Nine of twelve pilgrim badges agree with Central European deposits, while three pilgrim badges show a different Pb isotopic composition covering either Mediterranean, or Aegean or Mid to Eastern European sources. Interestingly most of the ore deposits allocated by the Pb isotopic composition of the pilgrim badges do not agree with the known place of manufacture.