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Die zuverlässige Bereitstellung zertifizierter Gasstandards ist ein wesentlicher Baustein für die Qualitätssicherung in Prüf- und Kalibrierlaboren. Der Vortrag beleuchtet die komplexen Prozesse und Einflussfaktoren, die bei der Herstellung solcher Referenzmaterialien – insbesondere Gasgemischen – eine Rolle spielen. Ein besonderer Fokus liegt dabei auf der praxisgerechten Ermittlung der Messunsicherheit entlang der gesamten Herstellungskette. Darüber hinaus wird die Zertifizierung von Primär- und Sekundärstandards im Kontext internationaler Akkreditierungsanforderungen dargestellt.
An accurate measurement of the amount fraction of hydrogen in gas mixtures is mandatory for practical applications, requiring methods that are fast, continuous, robust, and cost-effective. This study compares the performance of Raman and benchtop NMR process spectroscopy for determining the hydrogen amount fraction in gas mixtures. A setup was designed to integrate both techniques, enabling measurements of the same sample.
Tests were conducted with gravimetrically prepared gas mixtures of reference quality ranging from 1.20 cmol/mol to 85.83 cmol/mol of hydrogen. The results demonstrate that Raman spectroscopy provides superior performance, with a minimal root mean square error (RMSE) of 0.22 cmol/mol and excellent linearity. In contrast, benchtop NMR spectroscopy faced challenges, such as overlapping peaks and longer measurement times, resulting in a higher RMSE of 0.71 cmol/mol. Raman spectroscopy proves to be particularly well-suited for
practical applications due to its high accuracy and linearity. Meanwhile, benchtop NMR spectroscopy holds potential for future enhancements through ongoing technological advances, such as higher magnetic field strengths. In summary, the results from our study indicate that Raman spectroscopy is already a serviceable method for precise hydrogen quantification, whereas benchtop NMR spectroscopy can be attributed potential for future applications.
Accurate hydrogen quantification in natural gas mixtures is essential for various industrial applications, necessitating fast, reliable, and cost-efficient measurement techniques. In this study, we explore the combined use of Raman spectroscopy and benchtop NMR spectroscopy to assess their effectiveness in determining hydrogen concentrations. A specialized system was developed to integrate both methods, allowing simultaneous analysis of identical gas samples. Measurements were performed using a series of gravimetrically prepared gas mixtures with hydrogen concentrations ranging from 1.20 cmol/mol to 85.83 cmol/mol. Raman spectroscopy demonstrated superior accuracy, achieving a low root mean square error (RMSE) of 0.22 cmol/mol with excellent linearity. By contrast, benchtop NMR spectroscopy faced technical limitations, such as signal overlap and slower processing times, resulting in a higher RMSE of 0.71 cmol/mol. Raman spectroscopy's precision and quick response make it an excellent choice for practical applications, while ongoing developments in NMR technology, particularly improvements in magnetic field strength, could enhance its performance in the future. This study highlights Raman spectroscopy as a robust tool for hydrogen quantification, while benchtop NMR shows potential for future innovation in this field.
