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  • 1
    Electronic Resource
    Electronic Resource
    Gas chromatographic determination of formaldehyde in air using solid-phase microextraction sampling (1998)
    Springer
    Chromatographia 48 (1998), S. 95-100 
    Details
    ISSN: 1612-1112
    Keywords: Gas Chromatography ; Solid phase-microextraction ; Headspace chromatography ; Formaldehyde in air
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The optimization of in situ derivatization and preconcentration of formaldehyde in air using solid phase microextraction with gas chromatographic determination was investigated. A dimethylpolysiloxane coating (7 μm) solid-phase microextraction needle was used in the final procedure as a support for derivatizing reagents such as 2,4-dinitrophenylhydrazine and acetylacetone. Standard concentrations of formaldehyde in air were obtained using a headspace technique and equilibrium concentrations of formaldehyde in air were calculated using Henry's law. After derivatization on the fiber, the derivative was thermally desorbed in the injector of a gas chromatograph and analyzed using an electron capture detector. A detection limit of 0.17 mg m−3 was obtained. Calibration was done at 296 K. Reproducibility of the method was 9.6%. Some real air samples were also analyzed. The method is very convenient and ideal for the rapid determination of formaldehyde in air.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02467524
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Measurement of the composition of gas desorbed from coal by gas chromatography (1998)
    Springer
    Chromatographia 48 (1998), S. 154-155 
    Details
    ISSN: 1612-1112
    Keywords: Gas Chromatography ; Coal ; Desorbed gases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Direct methods for the determination of the gas content of a coal seam are based upon extracting a coal sample, enclosing it in a sealed container and measuring the volume of the gas evolved. In our work we measured evolved gas as a function of time, type and quantity of low rank coal (lignite) at normal (atmospheric pressure and temperature) conditions. The evolved gas was, collected in gas sampling bags and analyzed by GC for its main components (carbon dioxide, methane and dimethyl sulfide). From the parameters obtained (gas volume, CH4:CO2 ratio, rate of gas desorption, time concentration profile and different lithotypes of lignite) a more detailed identification of hazardous areas in underground coal extraction could be ensured.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02467533
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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