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Thermal standards from the laboratory of the government chemist

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Abstract

The Laboratory of the Government Chemist (LGC) is a focal point for the production, analysis and certification of reference materials. Within the field of thermal analysis the LGC is concerned with the development of purity standards and materials certified for enthalpy of fusion and melting point. For some time the LGC has been concerned with the significant differences in purity data which can be produced by the different manufactures' differential scanning calorimeters. This paper will highlight the initiatives the LGC is undertaking in overcoming this uncertainty in purity measurements through the use of certified thermal standards.

Zusammenfassung

Das Labor von Government Chemist (LGC) ist ein Mittelpunkt der Herstellung, Analyse und Zertifizierung von Referenzsubstanzen. Innerhalb des Bereiches Thermoanalyse beschäftigt sich LGC mit der Entwicklung von Reinheits-Standards und anderen, für Schmelzenthalpie und Schmelzpunkt zertifizierte Substanzen. Seit einiger Zeit bafaßt sich LGC mit signifikanten Abweichungen bei Reinheitsangaben, die sich zwischen den DSC-Geräten verschiedener Hersteller ergeben. Vorliegende Arbeit zeigt die Aktivitäten von LGC zur Überwindung dieser Unsicherheiten von Reinheitsmessungen unter Zuhilfenahme zertifizierter thermischer Standards.

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References

  1. ISO Guide 30 1981 (E)

  2. ISO Guide 31 1981 (E)

  3. ISO Guide 33 1989 (E)

  4. ISO Guide 35 1989 (E)

  5. R. J. L. Andon and J. E. Connett, Thermochim. Acta, 42 (1980) 241.

    Article  CAS  Google Scholar 

  6. F. Grønvold, Pure Appl. Chem., (in press)

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Joseph, B. Thermal standards from the laboratory of the government chemist. Journal of Thermal Analysis 40, 1447–1450 (1993). https://doi.org/10.1007/BF02546910

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  • DOI: https://doi.org/10.1007/BF02546910

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