SAMPLE INTRODUCTION APPROACHES FOR SOLID PHASE MICROEXTRACTION RAPID GC

摘要

Solid phase microextraction was used as the sample introduction technique for high-speed GC, The design of the dedicated injector was modified, and its operating conditions were optimized, Separation of BTEX was achieved in 8.4 s. The system was then used for separation of volatile organic compounds listed in EPA method 624. Short, narrow-bore Vocol and SPB-1 columns were used, Ion trap MS and FID were examined as detectors for high-speed separations. Separation of all 28 compounds detected by ITMS was achieved in less than 150 s. The possibility of using internally heated SPME fibers was then studied. Heating was achieved by passing an electric current directly through a wire used in place of the fiber or by casing a hollow fiber equipped with an internal microheater. The results indicate that internally heated fibers are a viable alternative to the dedicated injector.