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  • 2000-2004  (1)
  • 1890-1899  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    On-line monitoring of biogenic isoprene emissions using photoacoustic spectroscopy (2000)
    Springer
    Applied physics 70 (2000), S. 275-280 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 42.55; 42.62; 82.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Isoprene (C5H8) is one of the most important biogenic volatile organic compounds (VOCs) in the atmosphere. To calculate the impact of isoprene on atmospheric processes models have been developed that describe the isoprene release from plants. Measurements of this release require techniques for a fast, sensitive, on-line isoprene detection. Photoacoustic (PA) spectroscopy is applied here for the first time to monitor biogenic isoprene emissions. A CO overtone PA spectrometer is used for the detection, probing the C-H stretching vibrations in the 3 to 4 μm range. This allows us to detect isoprene down to a few ppb with a time resolution of one minute in a continuous gas flow. The number of laser lines can be adjusted to meet the requirements of the respective experiment in terms of time resolution and selectivity against other possibly interfering VOCs. This results in a highly versatile instrument for the isoprene detection in biological experiments. Furthermore, the infrared fingerprint offers the potential to detect different isoprene isotopomers simultaneously, thus allowing us to carry out on-line labelling experiments. The new apparatus was used to study the light dependence of isoprene emission from Eucalyptus globulus. The results demonstrate, that the detector system is a promising tool for the study of plant gas emissions. It allows the validation of existing emission models which are important for atmospheric processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050045
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Über Temperaturmessungen an Sulfatöfen (1897)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 10 (1897), S. 361-364 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.18970101202
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    Paper (German National Licenses)
    Fulltext
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