MULTIDIMENSIONAL GAS CHROMATOGRAPHY FOR THE SEPARATION OF TCDD ISOMERS

摘要

A multidimensional gas chromatographic technique with heartcuttingwas used for the determination of complex isomeric mixtures of tetra-chlorodibenzo-p-dioxins(TCDDs)which could not be completely separatedon a single capillary column.When using so-called heartcutting technique,only the interested single peak or section of the fraction eluting fromthe first column was transferred onto the second column with differentstationary phase.Flame ionization detection was used as the monitordetector and electron capture detection as the main detector.Thisarrangement offers complete separation and avoids interference of thepossible remained chlorinated solvents.The separation power of multi-dimensional GC was demonstrated by the determination of TCDD isomers.