Methodological aspects of headspace SPME: Application of the retention index system

✍ Scribed by Schäfer, Brit ;Hennig, Peter ;Engewald, Werner

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 397 KB
• Volume: 20
• Category: Article
• ISSN: 0935-6304
• DOI: 10.1002/jhrc.1240200407

✦ Synopsis

Abstract

The applicability of the retention index system to hcadspacc solid phase microextraxtion (HS–SPME) was investigated. In headspace SPME, the two equilibria gas phase/matrix and fiber coating/gas phase have to he considered. In this paper the equilibrium fiber coating/gas phase is discussed separately to characterize it more detailed and to investigate several methodical aspects. Therefore, the different distribution constants K~fiber/gas~ of n‐alkanes, which were used for reference compounds, were related to their Kováts retention indices. The validity of the derived linear relationship log K~fiber/gas~ versus retention index I is demonstrated for various examples. This relation is helpful for the assessment of distribution constants of substances not available and for the choice of a suitable fiber coating. Furthermore, quantification of analytes in the gas phase can be done without authentic substances.