title: Pressurized liquid extraction technique for the analysis of pesticides, PCBs, PBDEs, OPEs, PAHs, alkanes, hopanes, and steranes in atmospheric particulate matter.
abstract: An analytical method has been developed for the pressurized liquid extraction (PLE) of a wide range of semi-volatile organic compounds (SVOCs) from atmospheric particulate matter. Approximately 130 SVOCs from eight compound classes were selected as molecular markers of (1) agricultural activity (30 current and historic-use pesticides), (2) industrial activity (18 PCBs), (3) consumer products and building materials (16 PBDEs, 11 OPEs), and (4) motor vehicle exhaust (22 PAHs, 16 alkanes, 9 hopanes, 8 steranes). Currently, there is no analytical method validated for the extraction of all eight compound classes in a single automated technique. The extraction efficiencies of varying solvents and solvent combinations at high temperatures and pressures were examined. Extracts were concentrated and analyzed by gas chromatography coupled with mass spectrometry. The optimized PLE method utilized methylene chloride:acetone (2:1 v/v) at 100 °C with three (5 min) static cycles, flush volume of 80%, and a 100 s N2 purge. Spike and recovery experiments (n=7) provided average percent recoveries for pesticides, PCBs, PBDEs, OPEs, PAHs, alkanes, hopanes, and steranes of 88.8±4.0%, 86.9±2.6%, 83.8±2.9%, 101±6%, 90.3±6.1%, 74.4±8.8%, 104±8%, and 86.5±8.6%, respectively. The developed method was applied to atmospheric particulate matter samples collected in the greater Houston, TX metropolitan area. Ambient concentrations of eight classes of compounds (92 SVOCs) were reported in pg m(-3).
authors.affiliation: Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, TX 76798, USA.
authors.forename: Adelaide E
authors.initials: AE
authors.lastname: Clark
authors.affiliation: Department of Environmental Science, Baylor University, One Bear Place #97266, Waco, TX 76798, USA.
authors.forename: Subin
authors.initials: S
authors.lastname: Yoon
authors.affiliation: Department of Environmental Science, Baylor University, One Bear Place #97266, Waco, TX 76798, USA.
authors.forename: Rebecca J
authors.initials: RJ
authors.lastname: Sheesley
authors.affiliation: Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, TX 76798, USA; Department of Environmental Science, Baylor University, One Bear Place #97266, Waco, TX 76798, USA. Electronic address: Sascha_Usenko@Baylor.edu.
authors.forename: Sascha
authors.initials: S
authors.lastname: Usenko
mesh_terms: D000473:Alkanes / Q000032:analysis / Q000302:isolation & purification; D005591:Chemical Fractionation / Q000379:methods*; D003517:Cyclopentanes / Q000032:analysis / Q000302:isolation & purification; D004785:Environmental Pollutants / Q000032:analysis* / Q000302:isolation & purification*; D055768:Halogenated Diphenyl Ethers / Q000032:analysis / Q000302:isolation & purification; D013058:Mass Spectrometry; D010755:Organophosphates / Q000032:analysis / Q000302:isolation & purification; D052638:Particulate Matter / Q000737:chemistry*; D010575:Pesticides / Q000032:analysis / Q000302:isolation & purification; D011078:Polychlorinated Biphenyls / Q000032:analysis / Q000302:isolation & purification; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis / Q000302:isolation & purification; D011312:Pressure; D014315:Triterpenes / Q000032:analysis / Q000302:isolation & purification; D001335:Vehicle Emissions / Q000032:analysis; D055549:Volatile Organic Compounds / Q000032:analysis* / Q000302:isolation & purification*
chemical_list: D000473:Alkanes; D003517:Cyclopentanes; D004785:Environmental Pollutants; D055768:Halogenated Diphenyl Ethers; D010755:Organophosphates; D052638:Particulate Matter; D010575:Pesticides; D011084:Polycyclic Aromatic Hydrocarbons; D014315:Triterpenes; D001335:Vehicle Emissions; D055549:Volatile Organic Compounds; C025206:hopane; D011078:Polychlorinated Biphenyls
keywords: ASE; DISCOVER-AQ; OPFR; Organic tracers