title: Field-amplified sample stacking and nonaqueous capillary electrophoresis determination of complex mixtures of polar aromatic sulfonates.
abstract: Nonaqueous CE and field-amplified sample stacking have been used in the determination of complex mixtures of polar aromatic sulfonates (AS; mainly benzene- and naphthalenesulfonates) of environmental concern. The analytical procedure consists of an on-column aqueous sample enrichment, followed by the nonaqueous electrophoretic determination of stacked aromatic sulfonates. Various organic solvents were used as separation medium, acetonitrile and N-methylformamide gave the best results. Optimum capillary electrophoresis separation is obtained with ammonium acetate (25 mM) dissolved in N-methylformamide-methanol (90:10) as background electrolyte. This combined method was applied to the analysis of surface water samples spiked with selected aromatic sulfonates derivatives.
authors.affiliation: Departamento de Química Analítica, Nutrición y Bromatología, Facultad de Química, Universidad de Santiago de Compostela, Santiago, Spain.
authors.forename: Sergio
authors.initials: S
authors.lastname: Morales
authors.forename: Rafael
authors.initials: R
authors.lastname: Cela
mesh_terms: D000097:Acetonitriles; D002021:Buffers; D004573:Electrolytes; D019075:Electrophoresis, Capillary / Q000379:methods*; D005559:Formamides; D005618:Fresh Water / Q000032:analysis*; D000432:Methanol; D012997:Solvents; D013451:Sulfonic Acids / Q000032:analysis*
chemical_list: D000097:Acetonitriles; D002021:Buffers; D004573:Electrolytes; D005559:Formamides; D012997:Solvents; D013451:Sulfonic Acids; C002950:methylformamide; D000432:Methanol; C032159:acetonitrile