DETERMINATION OF PARTITION COEFFICIENTS OF MONOCYCLIC AROMATIC HYDROCARBONS BETWEEN LEAF ESSENTIAL OIL AND AIR BY HEADSPACE GAS CHROMATOGRAPHY

摘要

Partition coefficients of monocyclic aromatic hydrocarbons (MAHs) between leaf essential oil of nine plant species and air (K-EO/A) were determined using equilibrium partitioning in closed vials and headspace gas chromatography. K-EO/A values [mol 1(-1) (mol 1(-1))(-1)] ranged from 68 for benzene in Taxus baccata L. to 6038 for o-xylene in Juniperus x media Van Melle essential oil. Linear regression lines between log K-EO/A and log K-O/A (n-octanol/air partition coefficient) of the MAHs for the nine plant species were calculated Temperature dependence of K-EO/A was investigated in the temperature range from 5 degrees C to 45 degrees C and a linear relation between ln K-EO/A and 1/T was found.