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Unformatted text preview: ed on the small differences in conductivity caused by the presence of eluted
sample components. 17. A gas-phase sample is needed for mass spectrometry. The output of the LC
column is a solute dissolved in a solvent, whereas the output of the GC column is
a gas and thus is directly compatible. As a first step in LC/MS, the solvent must
be vaporized. When vaporized, however, the LC solvent produces a gas volume
that is 10-1000 times greater than the carrier gas in GC. Hence, most of the
solvent must also be removed. The analytes will elute in the order of decreasing polarity for a reversephase separation: diethyl ether, benzene, n-hexane....
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- Fall '08