Evaluation of behaviour of linear monoamines CH3–(CH2)n−1–NH2 (n=1–6) in ion chromatography Original Research Article

This paper reports the results on a study of ion chromatography (IC) behaviour on strong cationic exchange column of CH3–(CH2)n−1–NH2 (n=1–6) type linear monoamines. The eluents were mixtures of HCl–NaCl, HNO3–NaNO3, HClO4–NaClO4, H2SO4–Na2SO4, HClO4–NaClO4–CH3CN. Amines were revealed with an amperometric detector. The influence of different counter-ions on retention factors, k′, is discussed. Relationships between k′ and pE (E=sum of Na+ and H+ concentrations), and length of alkylic chain, and sensitivity coefficient S, are reported and discussed. The addition of acetonitrile (ACN) in the eluent was also taken into account. Suitable considerations are derived from these data. An example of monoamines separation is given.