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  • 1
    Electronic Resource
    Electronic Resource
    Activity coefficients for the system NaCl+Na2SO4+H2O at various temperatures. Application of Pitzer's equations (1992)
    Springer
    Journal of solution chemistry 21 (1992), S. 261-274 
    Details
    ISSN: 1572-8927
    Keywords: Pitzer's equations ; emf data ; mean activity coefficients ; sodium chloride ; mixing parameters ; temperature coefficients ; sodium chloride and sulphate binary system
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The mean activity coefficients of NaCl in the system NaCl+Na2SO4+H2O at various compositions were determined in the temperature range 5–45°C from the emf of potentiometric cells. By processing the results using Pitzer's equations the mixing parameters describing the non-ideal behavior of electrolytes were calculated. The temperature coefficients of the mixing parameters were determined and found not to be significant. The mixing parameters and temperature coefficients calculated for the binary mixture can be used to describe the behavior of multicomponent systems containing NaCl and Na2SO4, and eventually sea water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00647022
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Determination of nifedipine in human plasma by high performance liquid chromatography using column-switching technique (1994)
    Springer
    Microchimica acta 113 (1994), S. 171-178 
    Details
    ISSN: 1436-5073
    Keywords: nifedipine ; HPLC ; column switching technique ; electrochemical detection ; validation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A highly sensitive reversed-phase HPLC method has been developed for the determination of nifedipine in human plasma with electrochemical detection. A liquid-liquid extraction procedure is used in sample preparation with an average extraction recovery of 75%. Removing the highly lipophilic plasma components using a special column switching technique reduced the duration of the HPLC measurement from 30 to 9 min. The method is applicable for the pharmacokinetic characterization and bioavailability study of a sustained-release (retard) formulation of nifedipine and for human drug monitoring as it is indicated by the validation of the analysis method. The assay gave a linear response over the concentration range 2.5–50 ng/ml. All the validation parameters are within the internationally required limits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01243609
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    Paper (German National Licenses)
    Fulltext
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