SEPARATION AND DETERMINATION OF OLIGOMERS AND HOMOLOGS OF ALIPHATIC ALCOHOL ETHOXYLATES IN TEXTILE LUBRICANTS AND LUBRICANT EMULSION BY HIGH-PERFORMANCE LIQUID-CHROMATOGRAPHY

Homologous mixtures of 3,5-dinitrobenzenoates of aliphatic alcohol eth oxylates (AEs) were separated by high-performance liquid chromatograph y (HPLC) with high resolution using an amino bonded silica column and gradient elution of ternary solvents (hexane-dichloromethane-methanol) . When the method was combined with novel sample clean-up and extracti on procedures, oligomers of AEs in textile lubricants and a lubricant emulsion were satisfactorily determined with recoveries >75% and good reproducibility. A reversed-phase HPLC method was also developed to ch aracterise the alkyl groups of AEs.