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. Author manuscript; available in PMC: 2012 Feb 11.
Published in final edited form as: J Chromatogr A. 2010 Nov 16;1218(6):763–777. doi: 10.1016/j.chroma.2010.11.009

Figure 4.

Figure 4

Plots of k’ vs. 1/[C+] on the HC-COOH phase. Chromatographic conditions: 24/76 ACN/water with different amount of cationic displacer buffered by acetic acid (pH=5.0). 5.0 cm × 0.46 cm column, T = 40 °C, F = 1.0 ml/min. Cationic solutes: (■) Methcathinone; (▲) Ephedrine; (•) Cathinone. a. Solid lines displacer is NH4+. b. Dotted lines (....) displacer is n-BuNH3+. c. Dashed lines (----) displacer is n-OctNH3+.