Figure 3.

Comparative GC-MS chromatograms for the simultaneous measurement of borneol (bp, 212–214 °C), isoborneol (212–214 °C), camphor (204 °C), and naphthalene (218 °C) in either n-hexane (69 °C) or n-pentane (36 °C) under different PTV modes with various injection volumes. The signal intensities (peak areas) of the test compounds increased significantly as the injection volume increased from 2 to 20 μL for n-hexane and from 2 to 50 μL for n-pentane, but the noise levels (measured at m/z 95 and m/z 128) did not change substantially.