Density measurements are frequently associated to specific requirements to evaluate the quality of a process or to determine mass and/or volume of the material. Certified reference liquids can be used to assure metrological traceability of density measurements to the SI with uncertainty lower than 0.005%. This paper presents the new approach of INRIM to set density standards. The procedure involved accurate density determinations of some reference liquids which were supported by gas-chromatography coupled with mass spectrometry (GC–MS) in order to assess their homogeneity and short-term stability. GC–MS analyses on tetrachloroethylene and trichloroethylene were carried out before and after density measurements. Samples that had undergone to variations in density value showed also different gas-chromatographic profiles. In the same time, samples that had not undergone to density variations kept similar gas-chromatographic profiles. The results support the approach of combining independent methods in order to set physico-chemical properties of reference materials.

Stability assessment of density reference liquids supported by GC–MS analysis (density reference liquids stability supported by GC–MS) / Lorefice, Salvatore; Amico di Meane, E; Sega, Michela. - In: MEASUREMENT. - ISSN 0263-2241. - 43:5(2010), pp. 637-644. [10.1016/j.measurement.2010.01.005]

Stability assessment of density reference liquids supported by GC–MS analysis (density reference liquids stability supported by GC–MS)

LOREFICE, SALVATORE;SEGA, MICHELA
2010

Abstract

Density measurements are frequently associated to specific requirements to evaluate the quality of a process or to determine mass and/or volume of the material. Certified reference liquids can be used to assure metrological traceability of density measurements to the SI with uncertainty lower than 0.005%. This paper presents the new approach of INRIM to set density standards. The procedure involved accurate density determinations of some reference liquids which were supported by gas-chromatography coupled with mass spectrometry (GC–MS) in order to assess their homogeneity and short-term stability. GC–MS analyses on tetrachloroethylene and trichloroethylene were carried out before and after density measurements. Samples that had undergone to variations in density value showed also different gas-chromatographic profiles. In the same time, samples that had not undergone to density variations kept similar gas-chromatographic profiles. The results support the approach of combining independent methods in order to set physico-chemical properties of reference materials.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11696/34473
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