Fig. 1. Plot of extra-column band broadening corrected retention impedance times () vs. the effective plate number (N_eff) for propylbenzene (●), butylbenzene () and pentylbenzene (■) on a Zirchrom-PBD (a), a Zirchrom-carb (b) and a Nucleodur Gravity (c) column at temperatures of 30 °C (—), 90 °C (—) and 120 °C (—). The full lines are obtained by constraining the kinetic plot solutions by imposing an upper limit on the largest accessible u₀-value (u_0,max = 8 mm/s, corresponding to a maximal flow rate of about 5 ml/min). The dashed lines represent the free kinetic plot extrapolation already shown in Fig. 5 of Part I.

Fig. 2. Plot of extra-column band broadening corrected retention impedance times () vs. the effective plate number (N_eff) for propylbenzene (●), butylbenzene () and pentylbenzene (■) on a Zirchrom-PBD (a), a Zirchrom-carb (b) and a Nucleodur Gravity (c) column at temperatures of 30 °C (—), 90 °C (—) and 120 °C (—). The full lines are obtained by applying an additional constraint to the kinetic plot solution, i.e., it is imposed that only solutions are possible wherein the retained component peaks are wider than 1 s (w_p,lim = 1 s). The dashed lines represent the free kinetic plot extrapolation already shown in Fig. 5 of Part I.

Fig. 3. Plot of retention impedance times () vs. the effective plate number (N_eff) based on the uncorrected plate height data for propylbenzene (●), butylbenzene () and pentylbenzene (■) on a Zirchrom-PBD (a), a Zirchrom-carb (b) and a Nucleodur Gravity (c) column at temperatures of 30 °C (—), 90 °C (—), and 120 °C (—). The dashed lines represent the t_ER-plots based on the extra-column band broadening corrected plate height data already shown in Fig. 5 of Part I. The constraints on u_0,max and w_p,min are identical to those in Fig. 2.

Fig. 4. Same uncorrected retention impedance time data as in Fig. 3 but now calculated by assuming ΔP_var = ΔP_max − ΔP_ext instead of ΔP_max = 400 bar as was done in Fig. 3. The dashed lines represent the data shown in Fig. 3. The constraints on u_0,max and w_p,min are identical to those in Fig. 2.

Fig. 5. Same uncorrected retention impedance time data as in Fig. 3 (dashed curves) but now rescaled into a projection of what would be possible when using 1.5 μm particles instead of 3 μm particles (the T = 90 °C shown in Fig. 3a and b have been omitted for clarity). The constraints on u_0,max and w_p,min are identical to those in Fig. 2.

Fig. 6. Uncorrected retention impedance time data for butyl-benzene, experimentally determined on a Zirchrom-PBD (a), a Zirchrom-carb (b) and a Nucleodur Gravity (c) column for d_p = 3 μm (circles, experimentally determined data) and for d_p = 1.5 μm (triangles, extrapolated data, cf. Fig. 5) for T = 30 °C (black dashed lines) and the highest investigated column temperature (black full lines). The red full line data were obtained by starting from the black full lines and rescaling them to a pressure of ΔP_max = 1000 bar. The constraints on u_0,max and w_p,min are identical to those in Fig. 2. The horizontal dashed lines are the Knox and Saleem-limit lines for the various temperatures and pressures.