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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Water, air & soil pollution 68 (1993), S. 91-112 
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The transport and cycling of both natural and anthropogenic chemicals in the environment is an extremely dynamic process that is important for the well being of all earth's inhabitants. The atmosphere plays a major role in the transport and cycling of chemicals, especially those that are volatile or semi-volatile in nature. Atmospheric water, in the form of snow, fog, and rain can provide major transport pathways for chemicals that are distributed both regionally and globally. The concentrations of organic pollutants in the following compound classes have been measured in snow, rain, fog, and the ambient air surrounding the precipitation for the last seven years in urban, rural, and mountainous regions in Central and Northern Switzerland: n-alkanes, polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), polychlorinated dibenzofurans (PCDFs), polychlorinated dibenzodioxins (PCDDs), phenols, and a variety of volatile organic compounds (VOCs). Results from these sampling campaigns indicate that the pollutants measured were: 1) strongly influenced by artifacts associated with sampling, extraction, and analyses; 2) dependent on the local meteorological conditions; and 3) can be modeled quite well by equilibrium partitioning theory between the gaseous, aqueous, and particulate phases in the atmosphere.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Educational studies in mathematics 19 (1988), S. 269-275 
    ISSN: 1573-0816
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Aerosol photoemission (APE) has been found to be an excellent surrogate measure of particulate PAH concentration in combustion aerosols under a variety of laboratory and field conditions. Samples of oil stove, automobile exhaust, and urban air particulate matter were concurrently analyzed for aerosol photoemission intensity and particulate PAH concentration. In-situ, real-time analysis of the particulate matter was performed by UV-induced electron photoemission. Two photon energies, 4.9 and 6.7 eV, were chosen for irradiation. The latter energy was more sensitive and less selective. Particulate PAH concentrations were determined by collecting the particulate matter on a filter, solvent extracting the filter, and analyses of the extracts by gas chromatography / mass spectroscopy. Linear correlations (0.84≤r2≤1.00) were observed between aerosol photoemission intensities and the sum of particulate PAH concentrations for laboratory and field studies under a wide variety of conditions. The studies performed to date cover a dynamic range of three orders of magnitude (1 to 1000 ng / m3). The time resolution is in the order of a few seconds.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 10 (1987), S. 484-492 
    ISSN: 0935-6304
    Keywords: Capillary GC ; Extract concentration ; Kuderna-Danish concentration ; Whole column cryotrapping ; Trace analysis ; PCBs ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Many solvent extracts must be concentrated prior to analysis. Both Kuderna-Danish (K-D) concentration and inert gas blowdown are commonly used. Significant losses often occur with the latter. Solvent removal/thermal desorption (SRTD) on a precolumn was investigated here as an alternative or supplement to these methods. The compounds studied included polychlorinated biphenyls (PCBs) and polybrominated biphenyls (PBBs). SRTD was carried out by injecting 100 μL of extract into a cartridge-type precolumn, selectively volatilizing the solvent with a stream of carrier gas, then thermally desorbing the analytes to a fused silica capillary gas chromatography (GC) column. The mean total recoveries and mean standard errors obtained were 109 and ±12%, respectively. SRTD was found to give sharper peaks than were obtainable with on-column injection. Method detection limits accessible for PCBs by capillary GC with electron impact mass spectrometry with the assistance of SRTD were estimated. Overall, SRTD was found to be an effective, rapid, high recovery concentration method for solvent extracts.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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