Retention Behavior of Synthetic Pyrethroids in Capillary Supercritical Fluid Chromatography

Abstract

The parameters affecting the retention of synthetic pyrethroids on stationary phases of five polarities in capillary supercritical fluid chromatography were examined. Correlations between the logarithms of the capacity factor of the pyrethroids and the molecular weight, molar volume or polarizability were investigated. Although molar volume and polarizability were expected to exert the greatest effects because of steric parameters, the molecular weight had the highest correlation. For a series of compounds having a common framework, the molecular weight is one of the main factors affecting retention in addition to polarizability and other parameters. In general, better correlation coefficients were observed for nonpolar stationary phases than for polar stationary phases in studies of specific parameters.