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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Chromatography A 279 (1983), S. 649-655 
    ISSN: 0021-9673
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 321 (1985), S. 655-659 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Two methods for the determination of organic polychlorinated compounds and pesticides in moss samples are described. The techniques are suited to determine sub-ppb concentrations. Different homogenisation and extraction methods are used followed by column chromatography clean-up. High-resolution gas chromatography combined with electron capture detection or negative-ion chemical ionization mass spectrometry is employed for quantification. Recovery results, blank values and a comparison of both methods are presented. The techniques have been successfully used for the analysis of moss samples collected from Middle Europe to the Subarctic.
    Notes: Zusammenfassung Zwei Verfahren zur Bestimmung von polychlorierten organischen Verbindungen und Pesticiden in Moos werden beschrieben, die für den ppb-Bereich geeignet sind. Zur Homogenisierung und Extraktion dienen verschiedene Techniken, gefolgt von einem säulen-chromatographischen Clean-up. Zur Bestimmung dient die hochauflösende Gas-Chromatographie in Kombination mit Electron-capture-Detektion oder Massenspektrometrie durch chemische Ionisation mit negativen Ionen. Ein Vergleich beider Methoden wird gegeben sowie Wiederfindungsraten und Blindwerte für die verschiedenen Substanzen. Die Verfahren wurden erfolgreich auf Moosproben angewendet, die aus einem Gebiet von Mitteleuropa bis zur subarktischen Region gesammelt wurden.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Isomer-specific determination of polychlorinated dibenzofurans (PCDF) and dibenzo-p-dioxins (PCDD) was carried out in 37 samples of different fish species, crustaea and mussel from a fjord area contaminated by waste water from a Mg-factory. In addition 6 sediment samples were analysed. The tetra- and pentachlorodibenzofuran isomer pattern of the Mg-process is very characteristic and dominated by isomers with chlorine in the positions 1,2,3,7 and/or 8. Very similar patterns were found in sediment, crustacea and mussel samples up to 15 km from the factory. Nearly all isomers were present in crab, shrimp and mussel while fish samples contained mainly 2,3,7,8-substituted congeners. The isomer distributions and concentration levels for different species and tissues with high and low fat content are presented. The applied analysis techniques and the quality assurance procedure as well as practical problems are described in detail. The found levels varied between low ppt- and high ppb-levels for single isomers.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 319 (1984), S. 141-146 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The concentrations of organic polychlorinated compounds, fluoranthene and some quinones have been determined in Arctic air during meteorological situations typical for the summer and winter season. The organic pollutants in 600–900 m3 of air were collected on polyurethane foam and quantified by negative ion chemical ionization mass spectrometry. The results presented are a strong proof for the occurrence of long-range transport of organic pollutants to the Arctic.
    Notes: Zusammenfassung Die Konzentrationen an organischen polychlorierten Verbindungen, Fluoranthen und einigen Chinonen wurden in arktischer Luft unter meteorologischen Bedingungen gemessen, die für Sommer und Winter typisch sind. Die Verunreinigungen aus 600–900 m3 Luft wurden auf Polyurethanschaum gesammelt und mit Hilfe der chemischen Ionisierungs-Massenspektrometrie mit negativen Ionen analysiert. Die erhaltenen Ergebnisse beweisen den Ferntransport von Verunreinigungen in die Arktis.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary column ; HPLC prefractionation ; MS ; ECD ; Substituted PAHs ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A method is described which allows the determination of different substituted polycyclic aromatic hydrocarbons (PAH) such as NO2-PAH, carbazoles, keto-PAH, and aza-arenes in aerosol samples. Liquid CO2-extraction is used to minimize the loss of reactive compounds. High performance liquid chromatography on chemically activated silica is employed to prefractionate the samples into subfractions with a minimum of overlap between different PAH compound classes. Both electron capture detection and negative ion chemical ionization combined with capillary gas chromatography are used for identification and quantification. The latter method also allows distinction between isomers with different toxic properties when N2O/CH4 reaction gas mixtures are used. Selectivity for tetrachlorodibenzo-p-dioxins as against pesticides and polychlorinated biphenyls can be improved by this technique. The applicability of the method is critically discussed and different examples are given.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 5 (1982), S. 417-423 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary column ; Liquid chromatography (HPLC) for sample work-up ; Electron capture detection ; Negative ion chemical ionization MS ; Nitro-PAH detected without interference by carbazoles ; Detection limit for two to four ring nitro PAH 10-200 pg/m3 ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A method is described which allows the determination of subnanogram concentrations of mono- and dinitrated polyaromatic hydrocarbons with two to four ring systems in aerosol samples. High performance liquid chromatography is used to separate the nitro compounds from other classes of substances. Carbozoles elute in the same fraction. Both electron capture detection and negative ion chemical ionization mass spectrometry combined with capillary gas chromatography are used for quantification. Use of these two methods leads to a considerable improvement of selectivity and sensitivity for nitrated compounds. In contrast to the situation with a nitrogen-sensitive detector, carbazoles do not interfere and detection limits in the order of 10-200 pg/m3 are possible. The applicability of the method is critically discussed. Determination of nitrated polyaromatic hydrocarbons in aerosol samples from an aluminum smelter serves as an example.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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