CHEM 212 Lecture 32: Nov 25, 2016

• School: University of Victoria
• Department: Chemistry
• Course: CHEM 212
• Professor: Hamilton M.Coreen

Document Summary

Many types e. g. tcd, fid, ecd and ms. Can combine ggc with mass spec --> gc/ms or gc/ms/ms or ls/ms/ms. Ideally signal is proportional to amount go compound. Senses change sin conductivity of stationary phase when a compound is eluting. Non-destructive---> doesn"t break up your molecule like a mass spec. Small h2/o2 ame pyrolyzes sample compounds creating ionic species. Ionic species are sensed via a current between 2 electrodes. Use of 63ni source to cause movie phase to emit electrons. If sample components can capture these electrons, see a decrease in current = signal. Very selective response i. e. electronegative functional groups such as halogens, nitro and phosphate groups. Tends to be used for compounds with halogens or nitrogen containing compounds. Came into the world in the 80s when the world realized how bad pcbs are. Each component eluted from the gc is sent to a mass spectrometer. Powerful identi cation tool and also good for quanti cation.