Abstract
Particular nitrogen-containing compounds, in some cases individual isomers, can be identified in coal liquid samples by mass-analyzed ion kinetic energy spectrometry (MIKES). This is done directly, without prior treatment or fractionation of the sample. Isobutane chemical ionization (CI) is employed to give an approximate molecular weight profile of the coal liquid. Nitrogen-containing ions are recognized by their enhanced tendency for charge stripping as evident in E/2 mass spectra or by using ammonia as the CI reagent. In selected cases, comparison with authentic compounds has been used to verify the MIKES identifications.
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