Fig. 5.

Chromatogram of a ketone mixture (each substance at 500 ppb_v) of (1) acetone, (2) 2-butanone, (3) 2-pentanone, (4) 2-hexanone, (5) 2-heptanone, (6) 2-octanone, and (7) 2-nonanone in purified, dry air. Operating parameters are given in Table 1. IMS pressure p = 1019.5 hPa