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  • 82.80.Kq  (1)
  • Column liquid chromatography  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Photoacoustic phase spectrum of a layered sample (1995)
    Springer
    Applied physics 60 (1995), S. 419-423 
    Details
    ISSN: 1432-0630
    Keywords: 78.20.Hp ; 82.80.Kq ; 87.50.Hj
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Based on the Rosencwaig-Gersho theory (RG), we have studied the PhotoAcoustic Phase Spectrum (PAPS) of a two-layer sample. The theoretical results are mainly verified by an experiment, in which an intact plant leaf is used as the sample. The ratio of the optical absorption coefficient to the thermal diffusion coefficient for the subsurface layer can be obtained from the theoretical formula using measured phase values. The spectrum formed by the ratios at different wavelengths is in a good agreement with those experimentally obtained by phaseresolved photoacoustic spectroscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538344
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The chromatographic behavior of arsenic compounds on anion exchange columns with binary organic acids as mobile phases (1998)
    Springer
    Chromatographia 47 (1998), S. 257-263 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Ion exchange chromatography ; Anion-exchange chromatography ; Arsenic compounds ; Flame atomic absorption detector
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Identification and quantification of arsenic compunds was performed with high- performance liquid chromatography (HPLC) and flame atomic absorption spectrometry (FAAS) as element-specific detector. Arsenous acid, methylarsonic acid, dimethylarsinic acid, arsenic acid, arsenobetaine, and arsenocholine were separated on two anion-exchange columns (Synchropak Q 300 and PRP-X 100) with different binary organic acids as mobile phases. The infleunce of chromatographic parameters, such as pH and the concentration of the mobile phase were investigated. An unusual chromatographic behavior of arsenous acid was observed when tartaric acid was used as mobile phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02466529
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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