Pressure-programmed Gas-liquid Partition Chromatography

Abstract

NORMAL chromatograms of wide-range samples obtained under constant column inlet and outlet pressures give high narrow peaks and low wide peaks at short and long retention times respectively for equal concentrations; this observation is the basis of the theoretical plate value calculation. At longer retention times there is a risk of compounds remaining undetected. Temperature programming has been used to minimize this risk and enables wider range samples to be analysed; this technique also tends to equalize peak widths.