We have always been impressed by No1 Venema's deep knowledge on the most various fields of analytical and organic chemistry. He was an extraordinary, creative scientist, left his trace in everything he did, was interesting to talk to and fascinating to listen to.He had shown interest, maybe even enthusiasm, for large volume on-column injection and we will not forget his contribution at Riva del Garda in September 94, given in his typical style, with modesty but always charming, clear, presenting findings based on hard experimental data.Abstract. Improved instrumentation facilitates on-column injection of up to several hundreds of microliters onto GC capillary columns. It incorporates an autosampler with adjustable injection speed, a standardized precolumn system, an early vapor exit, and software that models evaporation of a given solvent at the flow and temperature conditions chosen by the user. The software calculates the appropriate injection speed, guides the autosampler correspondingly, and closes the vapor exit at a moment leaving in the prccolumn the amount of unevaporated solvent that is selected by the user. o 199s John wilcy KC S o n s , Inc.