title: Separation of oligomers of nonylphenyl ethylene oxide [correction of nonlphenylethylene oxide] on a porous graphitized carbon column.
abstract: The retention of nonylphenyl ethylene oxide oligomer surfactants was determined on a porous graphitized carbon (PGC) column using water--methanol mixtures as eluents. Linear correlations were calculated between the logarithm of the capacity factor (k') and the methanol concentration in the eluent. To test the validity of the hypothesis that in the case of homologous series of solutes the intercept and slope values are intercorrelated linear correlation was calculated between the two chromatographic parameters. To elucidate the role of the length of the polar ethylene oxide chain in the retention linear correlations were calculated between the chromatographic parameters and the number of ethylene oxide groups per molecule. Nonylphenyl ethylene oxide oligomers were well separated on the PGC column. Significant linear relationships were found between the corresponding chromatographic parameters indicating that the solutes behave as a homologous series of compounds. The retention of surfactants increased linearly with increasing number of ethylene oxide groups per molecule indicating hydrophilic interactions between the solutes and the surface of PGC support.
authors.affiliation: Central Research Institute for Chemistry, Hungarian Academy of Sciences, Budapest, Hungary.
authors.forename: T
authors.initials: T
authors.lastname: Cserháti
authors.forename: E
authors.initials: E
authors.lastname: Forgács
authors.forename: A
authors.initials: A
authors.lastname: Szilágyi
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006108:Graphite; D011092:Polyethylene Glycols / Q000737:chemistry*; D016062:Porosity; D012995:Solubility; D013501:Surface-Active Agents / Q000302:isolation & purification*; D014867:Water / Q000737:chemistry
chemical_list: D013501:Surface-Active Agents; D014867:Water; D011092:Polyethylene Glycols; D006108:Graphite