A TRIPLE REAGENT ION SOURCE FOR TRACE VOCS QUANTIFICATION BY SELECTED ION FLOWDRIFT TUBE MASS SPECTROMETRY

摘要

Selected Ion Flow-Drift Tube Mass Spectrometry, SIFDT-MS, was developed to quantify volatile organic compounds in air. The original instrument had two quadrupole mass filters: to select the reagent ions from the microwave discharge into the drift tube reactor and to analyze the product ions. To increase the sensitivity, the first quadrupole and the microwave discharge were replaced by a triple source creating the reagent ions by sequences of ion-molecule reactions.