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Accurate extrapolations of retention indices over the C1–C44 range in isothermal high resolution gas chromatography

Richtige Extrapolation von Retentionsindices über den C1–C44 Bereich in der isothermen Gas-Chromatographie

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Zusammenfassung

Eine Reihenentwicklung der Beziehung bei Homologen zwischen Kohlenstoffzahl und Nettoretentionszeit in der isothermen Gas-Chromatographie erlaubt eine richtige Extrapolation der experimentell erhaltenen Retentionsindices vom Methan bis zum C44-n-Alkan.

Als Basis für die Berechnung der Retentionsindices werden die Differenzen der Bruttoretentionszeiten verwendet. Auf diese Weise entfällt der Fehler einer experimentellen Totzeitbestimmung. Die beschriebene Methode kann als Hilfe zur Identifizierung komplexer Gemische insbesondere in Umweltproben genutzt werden. Durch Verwendung der homologen Reihe der n-Alkyl-trichloracetate (ATA) als Bezugspunkt für den Retentionsindex ist auch eine Anwendung des Elektroneneinfang-Detektors möglich.

Summary

Without changing the fundamentals of the Kovats retention index system, a non-linear power series expansion of the relationship between the logarithm of adjusted retention times versus carbon number allows accurate wide range extra- and intrapolations of retention indices.

The non-linear equation describes the experimental results for the n-alkanes starting with methane up to C44. The differences between the non-adjusted retention times are used for the calculations, thus avoiding any errors connected with the experimental determination of the dead time.

The method opens the field for data handling and compound identification of complex mixtures analyzed by high resolution gas chromatography. Such problems are routine in environmental analysis.

The homologous series of n-alkyl trichloroacetates (ATA) are used as retention index standards in electron capture detection.

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Ballschmiter, K., Heeg, F.J., Neu, H.J. et al. Accurate extrapolations of retention indices over the C1–C44 range in isothermal high resolution gas chromatography. Z. Anal. Chem. 321, 426–435 (1985). https://doi.org/10.1007/BF00487074

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