QUANTITATIVE ASPECTS OF DIRECTLY COUPLED SUPERCRITICAL-FLUID EXTRACTION CAPILLARY GAS-CHROMATOGRAPHY WITH A CONVENTIONAL SPLIT SPLITLESS INJECTOR AS INTERFACE

The quantitative aspects of on-line supercritical fluid extraction-cap illary gas chromatography (SFE-GC) with a split/splitless injector as interface were investigated. Special attention was paid to the discrim ination behavior and the reproducibility of the split/splitless interf ace. A simple experimental set-up is proposed that allows accurate qua ntitation in on-line SFE-split GC. The results obtained in on-line SFE -GC compare favorably with those from conventional GC with split injec tion. Discrimination was found to be absent when working at sufficient ly high interface temperatures. Finally, the effects of the carbon dio xide flow rate, interface temperature and split ratio on both discrimi nation and reproducibility were studied.