LARGE-VOLUME INJECTION IN RESIDUE ANALYSIS WITH CAPILLARY GAS CHROMATOGRAPHY USING A CONVENTIONAL AUTOSAMPLER AND INJECTION BY PROGRAMMED-TEMPERATURE VAPORIZATION WITH SOLVENT VENTING

摘要

Large-volume injection in capillary gas chromatography may be used to compensate for the limited detection sensitivity of selective detectors when further evaporation of sample extracts is not feasible owing to increasing losses of volatile solutes or because the analytical method can no longer be performed automatically. Large-volume injection using programmed-temperature vaporization (PTV) with solvent venting has proved its worth as an on-line pre-chromatographic sample concentration technique that permits the reproducible analysis of pesticide residues over a wide volatility range.