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60 Multidimensional Chromatography
Two-dimensional separation of dimethylnaphthalenes in crude oil using a 50 m methyl (95%)/phenyl (5%) polysiloxane primary
column and a 50 m methyl (50%)/phenyl (25%)/cyanopropyl (25%) polysiloxane secondary column. The top trace indicates the primary separation
107 (20). while the following chromatograms indicate individual heart-cut secondary analysis. Reproduced from R.G. Schäfer and J. Höltkemeir,
260,
1992,
Figure 3.4 monitor, Anal. Chim. Acta,
