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  • Joule–Thomson  (1)
  • derivative spectrophotometry  (1)
  • Springer  (2)
  • American Chemical Society (ACS)
  • 1
    Electronic Resource
    Electronic Resource
    Three-Parameter Corresponding-States Correlations for Joule–Thomson Inversion Curves (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 1737-1751 
    Details
    ISSN: 1572-9567
    Keywords: correlation ; corresponding-states ; inversion curve ; Joule–Thomson
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In the present work, the Lee–Kesler (LK) and Boublík–Alder–Chen–Kreglewski (BACK) equations of state were used to compute Joule–Thomson inversion curves for nonsimple fluids. Comparisons with available data showed that predictions were quite reliable and could be used in place of experimental values. Two sets of corresponding-states correlations were developed, giving reduced inversion pressures and densities as functions of reduced temperature and acentric factor. The LK-based correlations are valid for T r≤4.0, giving an average absolute deviation (AAD) of 4.5% for pressures. The BACK-based correlations are valid up to the maximum inversion temperature and give a 6.7% AAD for pressures. Respective volume AADs are 12.0 and 8.0% in the high-density region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022662030434
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  • 2
    Electronic Resource
    Electronic Resource
    Determination of tungsten with pyrocatechol violet by first-derivative solid-phase spectrophotometry (1994)
    Springer
    Microchimica acta 112 (1994), S. 225-235 
    Details
    ISSN: 1436-5073
    Keywords: solid-phase spectrophotometry ; derivative spectrophotometry ; pyrocatechol violet ; tungsten determination ; natural and industrial waters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Derivative spectrophotometry was applied to solid-phase spectrophotometry in order to enhance its sensitivity and remove the large background caused by the absorbance of the resin layer. Determination of micro-amounts of tungsten with pyrocatechol violet to form a 2∶1 green complex in acid medium which is fixed on a dextran-type anion-exchange resin (Sephadex QAEA-25) is described as an example for the application of this technique. The absorbance of the resin packed in a 1-mm spectrophotometric cell, was measured directly. The characteristic peak amplitude of the signal at 674 nm in the first-derivative spectrum is useful for quantitative determination of tungsten (3–16 μg 1−1; RSD 5.8%) in natural and industrial water samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01242838
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