INVESTIGATION OF PARAMETERS AFFECTING THE ONLINE COMBINATION OF SUPERCRITICAL-FLUID EXTRACTION WITH CAPILLARY GAS-CHROMATOGRAPHY

Two different injectors, a split/splitless injector and a programmed t emperature vaporizer (PTV) injector were investigated as the interface in on-line supercritical fluid extraction (SFE)-capillary gas chromat ography (cGC). The parameters affecting the chromatographic peak shape s as well as the quantitative performance of the interfaces in on-line SFE-cGC were identified and studied. Particular attention was paid to the case where modified extraction fluids were used. Experiments were performed on two different samples. The first sample consisted of PAH s spiked on sand at different concentration levels. The other sample w as a polymeric material.