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356 Multidimensional Chromatography
Figure 13.12 Illustration of the clean-up method, showing the analysis of an air sample (a)
with and (b) without column switching. Details of the analytical conditions are given in the
text. Reprinted from Journal of Chromatography, A 697, P. R. Kootstra and H. A. Herbold,
‘Automated solid-phase extraction and coupled-column reversed-phase liquid chromatogra-
phy for the trace-level determination of low-molecular-mass carbonyl compounds in air’,
pp. 203–211, copyright 1995, with permission from Elsevier Science.
