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  • 1
    Electronic Resource
    Electronic Resource
    Erratum (1988)
    Springer
    European food research and technology 187 (1988), S. 250-250 
    Details
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01043349
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Kontaminationen von Lebensmitteln über die Gasphase durch Tetrachlorethen-Emissionen einer chemischen Reinigung (1987)
    Springer
    European food research and technology 185 (1987), S. 267-270 
    Details
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Description / Table of Contents: Zusammenfassung In Wohnhäusern betriebene Chemische Reinigungen können Wohnungen und darin gelagerte Lebensmittel mit Tetrachlorethen (Perchlorethylen) und anderen leichtflüchtigen Halogenkohlenwasserstoffen belasten. Es werden Analysenverfahren zur Bestimmung von Tetrachlorethen und anderen leichtflüchtigen chlorierten Kohlenwasserstoffen in Lebensmitteln, Haupthaaren, Hausstaub und Textilien beschrieben und die Befunde aus einer durch eine chemische Reinigung belasteten Wohnung mitgeteilt. Die Kontaminationen, insbesondere bei fettreichen Lebensmitteln, waren extrem hoch
    Notes: Summary Tetrachloroethene (perchloroethylene) and other volatile organic compounds may contaminate the surroundings of dry-cleaning units. Increased concentrations of tetrachloroethene were found in food, human hair, textiles and dust from a vacuum cleaner in a home situated above a dry-cleaning unit. The concentrations were found to be extremely high in food rich in fat. The analytical procedure for the above-mentioned samples is described
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01123029
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Optical sensor for seawater salinity (2000)
    Springer
    Fresenius' journal of analytical chemistry 368 (2000), S. 196-202 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract An optical sensor for the measurement of salinity in seawater has been developed. It is based on a chloride-quenchable fluorescent probe (lucigenin) immobilized on a Nafion film. Two approaches for measuring salinity via chloride concentration are presented. In the first, a change in salinity corresponds to a change in the fluorescence intensity of lucigenin. In the second, the fluorescence intensity information is converted into a phase angle information by adding an inert phosphorescent reference luminophore (a ruthenium complex entrapped in poly(acrylonitrile) beads). Under these conditions, the chloride-dependent fluorescence intensity of lucigenin can be converted into a chloride-dependent fluorescence phase shift which serves as the analytical information. This scheme is referred to as dual lifetime referencing (DLR). The sensor was used to determine the salinity in seawater and brackish water of the North Sea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160000493
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Fiber Optic Ion-Microsensors Based on Luminescence Lifetime (1999)
    Springer
    Microchimica acta 131 (1999), S. 25-28 
    Details
    ISSN: 1436-5073
    Keywords: Key words: microsensor; energy transfer; luminescence decay time; ion sensor.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract  Fiber optic ion-microsensors based on luminescence decay time have been developed for chloride and potassium. The fiber tip coatings consist of the respective ion-selective lipophilic ion carrier, plasticized PVC, and the ruthenium(II) tris-4,4′-diphenyl-2,2′-bipyridyl ion-pair with Bromothymol Blue [Ru(dibipy)3(BTB)2] as a proton donor. The efficacy of radiationless fluorescence energy transfer from the donor (the ruthenium complex) to the acceptor (BTB) is mediated by the ion concentration within the samples. The chloride response is based on the co-extraction of chloride along with protons from the aqueous sample into a plastiziced PVC membrane, whereas in the presence of potassium ions in the sample, the neutral BTB becomes deprotonated on extraction of potassium ions, with the release of protons. Both processes result in a change in BTB absorbance. The absorption band of deprotonated BTB overlaps significantly with the emission band of the ruthenium complex, allowing radiationless energy transfer to take place.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s006040050005
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    Paper (German National Licenses)
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