Process and device for split and splitless sampling onto capillary columns using the syringe

摘要

In the split sampling gas chromatographic process for analyzing a sample by introducing the needle of a syringe into the vaporization chamber of a gas chromatographic column, discharging a liquid sample from the syringe needle into the vaporization chamber, and passing the vapors of the sample through a chromatographic column along with a carrier gas, the improvement which comprises passing a cooling gas over the entire length of the syringe needle, thereby to cool the sample passing therethrough. The cooling may be effected by a flow of liquid or gaseous CO2, air or nitrogen through a tube which surrounds the needle over its length during introduction of the sample.