Application of Pentafluorobenzyl and Hexafluoroisopropyl Esters for Retention Indexes in GC-Negative Ion Chemical Ionization MS

In order to use the linear temperature programmed retention index (LTRI) for the negative ion chemical ionization (NCI) mode in which n-alkanes cannot be detected, LTRIs were newly defined using homologous series of pentafluorobenzyl and hexafluoroisopropyl esters. The method for converting LTRI based on n-alkanes to the new LTRIs was also developed and applied to PCB and chlorinated pesticide analysis. The results demonstrated that the LTRI databases, which were developed based on n-alkanes, could be utilized for NCI analysis.