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. Author manuscript; available in PMC: 2011 Nov 16.
Published in final edited form as: J Chromatogr A. 2007 Dec 7;1182(1):41–55. doi: 10.1016/j.chroma.2007.11.104

Fig. 4.

Fig. 4

Plot of k’ vs. 1/[TEAH+] on −SO3-HC-C8-H. Chromatographic conditions: 50/50 MeCN/H2O with 0.1% formic acid and 20, 40, 60 or 80 mM TEA.HCl, 5.0×0.46 cm column, T = 40 °C, F = 1.0 mL/min. Cationic solutes: ◆: morphine; ∗: hydromorphone; △: cathinone; ◇: ephedrine; +: 3,4-methylenedioxyamphetamine; ▲: methamphetamine.