SummaryThe chromatographic separation properties of long, thin adsorption tubes enable substance-specific quantitative enrichment and reduction to be achieved when sampling and thermal desorption are carried out in the same flow direction.The specific retention volumes, and also the breakthrough and peak end volumes, of 69 compounds in the boiling range between -1 64 and 126OCand of a relative molecular mass between 16 and 11 9 were determined at temperatures between 30 and