The Reproducibility of GC Retention Index and Quantitative Value on the Purge and Trap System

Abstract

The adaptability and precision of the Retention Index (RI), calculated on the conventional Purge and Trap Concentration System(PTC-GC), were examined. The RI values about 9 aldehydes, 10 alcohols and other 16 model compounds were measured five times on two columns of OV-101 and CARBOWAX-20M. The limit of RI values calculated on PTC-GC was 500-1900. This upper limit corresponds to hepatadecanal for aldehyde and hexadecanol for alcohol. The reproducibility of the RI values on both columns was same as that of direct injection GC, and the standard deviations of their RI values were in 0-1.1. Also the reproducibility of quantitative analysis on the PTC-GC was almost same as that on direct injection GC analysis. However, the recovery of compounds having high boiling point or higher polarity was low.