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  • 1985-1989  (2)
  • 1989  (2)
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  • 1985-1989  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Classification of Whiskies by Principal Component Analysis (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 54 (1989), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Trace components in forty-eight samples in five whiskey categories were extracted into methylene chloride, concentrated and separated by capillary column gas chromatography. The technique of principal component analysis was applied to the peaks in the resulting gas chromatograms and the samples formed clusters according to category. Further studies showed that variation in sample composition due to dilution, blending, or contamination using a model contaminant could be detected with good sensitivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1989.tb05990.x
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Method for the determination of chromium (VI) as chromium (VI)-dibenzyidithiocarbamate (1989)
    Springer
    Microchimica acta 98 (1989), S. 67-76 
    Details
    ISSN: 1436-5073
    Keywords: chromium ; speciation ; UV-VIS ; dibenzyldithiocarbamic acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Dibenzyldithiocarbamic acid (DBDC) exhibits the ability to speciate between chromium(VI) and chromium(III), since only the chromium(VI) will form complexes with DBDC. The complex is then extracted into an organic solvent and assayed using an ultraviolet-visible (UV-VIS) spectrophotometer at 498.8 nm. Using 250 ml of aqueous sample detection limits less than 1 ng/ml are possible, while the linear range extends to 500 gmg/ml when working at 498.8 nm. Oxidation of the chromium(III) to chromium (VI) using cerium (IV) enables the determination of total chromium and subsequently the chromium (III) in solution. Evaluation of the method with a standard reference material produced only 4.81 part per thousand error in the determination of chromium(VI).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01244519
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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