Gravimetric preparation and characterization of primary reference solutions of molybdenum and rhodium

Gravimetrically prepared mono-elemental reference solutions having a well-known mass fraction of approximately 1 g/kg (or a mass concentration of 1 g/L) define the very basis of virtually all measurements in inorganic analysis. Serving as the starting materials of all standard/calibration solutions,...

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Published in:Analytical and bioanalytical chemistry 2015-04, Vol.407 (11), p.3093-3102
Main Authors: Kaltenbach, Angela, Noordmann, Janine, Görlitz, Volker, Pape, Carola, Richter, Silke, Kipphardt, Heinrich, Kopp, Gernot, Jährling, Reinhard, Rienitz, Olaf, Güttler, Bernd
Format: Article
Language:English
Subjects:
Analytical Chemistry
Biochemistry
Calibration
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Digestion
Food Science
Gravimeters
Inductively coupled plasma
Laboratory Medicine
Links
Mass spectrometry
Metals
Metrology
Molybdenum
Monitoring/Environmental Analysis
Plasma
Purity
Reference Materials for Chemical Analysis
Research Paper
Rhodium
Scientific imaging
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Summary:Gravimetrically prepared mono-elemental reference solutions having a well-known mass fraction of approximately 1 g/kg (or a mass concentration of 1 g/L) define the very basis of virtually all measurements in inorganic analysis. Serving as the starting materials of all standard/calibration solutions, they link virtually all measurements of inorganic analytes (regardless of the method applied) to the purity of the solid materials (high-purity metals or salts) they were prepared from. In case these solid materials are characterized comprehensively with respect to their purity, this link also establishes direct metrological traceability to The International System of Units (SI). This, in turn, ensures the comparability of all results on the highest level achievable. Several national metrology institutes (NMIs) and designated institutes (DIs) have been working for nearly two decades in close cooperation with commercial producers on making an increasing number of traceable reference solutions available. Besides the comprehensive characterization of the solid starting materials, dissolving them both loss-free and completely under strict gravimetric control is a challenging problem in the case of several elements like molybdenum and rhodium. Within the framework of the European Metrology Research Programme (EMRP), in the Joint Research Project (JRP) called SIB09 Primary standards for challenging elements , reference solutions of molybdenum and rhodium were prepared directly from the respective metals with a relative expanded uncertainty associated with the mass fraction of U rel ( w ) 
ISSN:1618-2642
1618-2650
DOI:10.1007/s00216-014-8395-2