TECHNIQUES FOR DISCRETE SAMPLE INTRODUCTION INTO FLOW INJECTION SYSTEMS

摘要

Much has been written about sample introduction into Gas Chromatography (GC) and other FlowrnInjection Analysis (FIA) systems. There are split, splitless, cool on column, retention gap, headspace,rnand full evaporation techniques among others prescribed to get the job done right. This documentrnintends to present the fundamental criteria for doing the job right based on the items that can make thernjob go wrong. Discrimination and other causes of analyte losses will cause a distortion of the samplernrepresentation. Large volume changes, pressure pulsing, and time / space broadening can degraderncomponent separation. The discussion will address techniques to avoid problems and produce anrnimproved introduction scheme. These will focus on Markelov’s “Full Evaporation Technique”, thern“Beche Injection Process” and provide suggestions on how to achieve “Large Sample-AnalyternConcentration Schemes” for discrete sample introduction.