CARTRIDGES PACKED WITH MACROPOROUS POLYMER SORBENTS FOR PRECONCENTRATING PRIMARY ALIPHATIC-AMINES AND THEIR DETERMINATION BY HIGH-PERFORMANCE LIQUID-CHROMATOGRAPHY

Adsorption isotherms of n-butylamine on silica gel modified by hexadec yl groups and on polystyrene sorbents are described by the Langmuir eq uations. Polystyrene is characterized by a higher adsorption capacity and a higher distribution coefficient. The breakthrough volumes of n-b utylamine (1 x 10(-3) M in water) are 100 and 175 mL, for polystyrene and hexadecyl-modified silica gel (silica C16), respectively. Quantita tive desorption of alkylamines from the studied sorbents is attained b y passing 2 mL of an ethanol-hydrochloric acid mixture. A procedure is proposed for the adsorption preconcentration of alkylamines from aque ous solutions followed by their chromatographic determination.