title: Comparison of two capillary electrophoresis online stacking modes by analysis of polycyclic aromatic hydrocarbons in airborne particulates.
abstract: Naphthalene, fluorene, pyrene, anthracene, phenanthrene, and chrysene were successfully separated by CD-modified MEKC (CD-MEKC) using 20 mM borate (pH 9.0) containing 90 mM SDS and 75 mM beta-CD. Two online stacking methods, i.e., sweeping and field-enhanced sample injection (FESI), were explored to enhance the detection sensitivity. The influences of some crucial parameters in sweeping and FESI procedures were investigated. For FESI method, a plug of water and low-conductivity sample matrix was used to increase the stacking efficiency. Compared with the sweeping method, FESI can increase the sensitivity in the range of 10-20-fold. The proposed method was used for the analysis of polycyclic aromatic hydrocarbons in airborne particulates.
authors.affiliation: State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, P. R. China.
authors.forename: Guan-Qun
authors.initials: GQ
authors.lastname: Song
authors.forename: Zhen-Lei
authors.initials: ZL
authors.lastname: Peng
authors.forename: Jin-Ming
authors.initials: JM
authors.lastname: Lin
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D020374:Chromatography, Micellar Electrokinetic Capillary / Q000379:methods* / Q000706:statistics & numerical data; D019075:Electrophoresis, Capillary / Q000379:methods* / Q000706:statistics & numerical data; D009862:Online Systems; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis*; D012680:Sensitivity and Specificity; D047392:beta-Cyclodextrins
chemical_list: D000393:Air Pollutants; D011084:Polycyclic Aromatic Hydrocarbons; D047392:beta-Cyclodextrins; C031215:betadex