melamine is separated by column chromatography using cation and anion exchange resin and determined by ion-pair liquid chromatography using an ods column and a mixture of acetonitrile and 0.05m phosphate buffer ( ph 3.0 ) containing 0.005m sodium 1-laurylsulfate ( 1 + 4 , v/v ) as mobile phase .
C0007447
cation
C0022023
ion