Nitrogen compounds in
gasoline were extracted by liquid-liquid extraction and analyzed by gas chromatography-surface ionization detector (GC-
SID). Compared with the chromatograms obtained from GC-flame ionization detector (FID), GC-thermal ionization detector (
NPD) and GC-mass spectrometry (MS), the peaks in the chromatogram obtained by GC-
SID were assigned to the
nitrogen compounds in
gasoline. Most of these
nitrogen compounds could not be detected by FID or
NPD, which demonstrated the high selectivity and sensitivity of the
SID. The types of
nitrogen compounds in three
gasoline samples (90#, 93#, 97#) were similar, but their contents varied with different
gasoline brands. The extracted
nitrogen compounds were mainly
anilines, the amounts of which in the three
gasoline samples were different. Trace amounts of several high boiling point
nitrogen compounds were successfully detected because of the high sensitivity of
SID. The
SID is superior to the commercial
NPD in detecting the
nitrogen compounds in
gasoline samples. In view of its high sensitivity and selectivity, the
SID is a promising GC detector.