SOLVENT TRAPPING DURING LARGE-VOLUME INJECTION WITH AN EARLY VAPOR EXIT, PART 2 - CHROMATOGRAPHIC RESULTS AND CONCLUSIONS

Solvent trapping reconcentrates volatile components after injection or on-line transfer of large volumes. When an early vapor exit is used, typically after a 5-10 m x 0.53 mm i.d. uncoated precolumn, the solven t trapping process differs from that described previously. The visual experiments and the conclusions drawn therefrom, as described in a pre vious paper, are supplemented with chromatographic results. They show that even hexane ran be quantitatively analyzed in 250 mu l of a penta ne solution. Injection of a volume of 250 mu 1 by vaporizer/precolumn solvent splitting was used in the analysis of gasoline in drinking wat er. Conditions for the transfer of a 1000 mu l volume can easily be ad justed through detection of the front end of the flooded zone by a the rmocouple mounted on the outer wall of the precolumn.