title: Identification of organic compounds in atmospheric aerosol particles by on-line supercritical fluid extraction-liquid chromatography-gas chromatography-mass spectrometry.
abstract: Atmospheric particles were collected with a high-volume sampling system at an urban site in Helsinki (Finland). The samples were analysed by on-line coupled supercritical fluid extraction-liquid chromatography-gas chromatography-mass spectrometry (SFE-LC-GC-MS). The aerosol sample was first extracted by SFE. The extract was then transferred to a liquid chromatograph where it was fractionated into four fractions according to polarity. Each fraction from the liquid chromatograph was transferred to a gas chromatograph by large-volume injection, where final separation was carried out. The first LC fraction (280 microl) contained nonpolar compounds, such as n-alkanes, hopanes and steranes. The second fraction (840 microl) included polycyclic aromatic hydrocarbons (PAHs) and alkyl-PAHs, while the third and fourth fractions (840 microl each) contained more polar compounds, such as n-alkan-2-ones, n-alkanals, oxy-PAHs and quinones.
authors.affiliation: Laboratory of Analytical Chemistry, Department of Chemistry, University of Helsinki, PO Box 55, FIN-00014 University of Helsinki, Helsinki, Finland.
authors.forename: Masahiko
authors.initials: M
authors.lastname: Shimmo
authors.forename: Piia
authors.initials: P
authors.lastname: Anttila
authors.forename: Kari
authors.initials: K
authors.lastname: Hartonen
authors.forename: Tuulia
authors.initials: T
authors.lastname: Hyötylänen
authors.forename: Jussi
authors.initials: J
authors.lastname: Paatero
authors.forename: Markku
authors.initials: M
authors.lastname: Kulmala
authors.forename: Marja-Liisa
authors.initials: ML
authors.lastname: Riekkola
mesh_terms: D000336:Aerosols / Q000737:chemistry*; D001272:Atmosphere; D002853:Chromatography, Liquid / Q000379:methods*; D025924:Chromatography, Supercritical Fluid / Q000379:methods*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D009930:Organic Chemicals / Q000032:analysis*
chemical_list: D000336:Aerosols; D009930:Organic Chemicals