title: Semi-continuous sampling of health relevant atmospheric particle subfractions for chemical speciation using a rotating drum impactor in series with sequential filter sampler.
abstract: To achieve unattended continuous long-term (eg., 1 week) sampling of size-segregated 24-h ambient particulate matter (PM), a sampling strategy of a modified 3-stage rotating drum impactor (RDI) in series with a sequential filter sampler was introduced and verified in a field campaign. Before the field sampling, lab experiment was conducted to test the collection efficiency of the third stage of the RDI using the quartz-fiber filter (QFF) as the substrate. The measured value is 0.36 μm, which is larger than the nominal value 0.1 μm. A fast direct analysis of organic species in all size fractions (<0.36, 0.36-1, 1-2.4, and 2.4-10 μm) of 24-h ambient samples was done using in situ derivatization thermal desorption gas chromatography time-of-flight mass spectrometry (IDTD-GC-TOFMS). A few secondary originated polar markers (dicarboxylic acids, cis-pinonic acid, etc.) were introduced and evaluated using this method for the first time and quantified simultaneously with polycyclic aromatic hydrocarbons (PAH) in the filter samples (<0.36 μm). For the other RDI strip samples (0.36-1, 1-2.4, and 2.4-10 μm), PAH and levoglucosan were quantified. The comparability of two such sampler sets was verified with respect to the PM collection profile of the two RDIs as well as measured concentration of chemical compounds in each sampled size fraction, so that a future epidemiological study on the relationship between the finest PM/its chemical composition and health outcome could be carried out through parallel sampling at two sites. The internal correlations between the size-segregated organic compounds are discussed. Besides, the correlations between the size-segregated organic species and size-segregated particulate number concentration (PNC) as well as meteorological parameter are discussed as well.
authors.affiliation: Joint Mass Spectrometry Center, Cooperation Group Comprehensive Molecular Analytics, Helmholtz Zentrum München, Neuherberg, Germany.|Joint Mass Spectrometry Center, Chair of Analytical Chemistry, University of Rostock, Rostock, Germany.
authors.forename: Fengxia
authors.initials: F
authors.lastname: Li
authors.affiliation: Joint Mass Spectrometry Center, Cooperation Group Comprehensive Molecular Analytics, Helmholtz Zentrum München, Neuherberg, Germany. juergen.schnelle@helmholtz-muenchen.de.
authors.forename: Jürgen
authors.initials: J
authors.lastname: Schnelle-Kreis
authors.affiliation: Joint Mass Spectrometry Center, Cooperation Group Comprehensive Molecular Analytics, Helmholtz Zentrum München, Neuherberg, Germany.
authors.forename: Erwin
authors.initials: E
authors.lastname: Karg
authors.affiliation: Institute of Epidemiology II, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany.|Environmental Science Center (WZU), University of Augsburg, Augsburg, Germany.
authors.forename: Josef
authors.initials: J
authors.lastname: Cyrys
authors.affiliation: Environmental Science Center (WZU), University of Augsburg, Augsburg, Germany.
authors.forename: Jianwei
authors.initials: J
authors.lastname: Gu
authors.affiliation: Joint Mass Spectrometry Center, Cooperation Group Comprehensive Molecular Analytics, Helmholtz Zentrum München, Neuherberg, Germany.|Joint Mass Spectrometry Center, Chair of Analytical Chemistry, University of Rostock, Rostock, Germany.
authors.forename: Jürgen
authors.initials: J
authors.lastname: Orasche
authors.affiliation: Joint Mass Spectrometry Center, Cooperation Group Comprehensive Molecular Analytics, Helmholtz Zentrum München, Neuherberg, Germany.
authors.forename: Gülcin
authors.initials: G
authors.lastname: Abbaszade
authors.affiliation: Institute of Epidemiology II, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany.|Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, MA, USA.
authors.forename: Annette
authors.initials: A
authors.lastname: Peters
authors.affiliation: Joint Mass Spectrometry Center, Cooperation Group Comprehensive Molecular Analytics, Helmholtz Zentrum München, Neuherberg, Germany.|Joint Mass Spectrometry Center, Chair of Analytical Chemistry, University of Rostock, Rostock, Germany.
authors.forename: Ralf
authors.initials: R
authors.lastname: Zimmermann
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D004784:Environmental Monitoring / Q000379:methods*; D005374:Filtration / Q000379:methods; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis*; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis*
chemical_list: D000393:Air Pollutants; D052638:Particulate Matter; D011084:Polycyclic Aromatic Hydrocarbons
keywords: Chemical speciation; In situ derivatization thermal desorption; PAH; Polar markers; Rotating drum impactor; Size-segregated particulate matter