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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
    Surface chemistry and potential response of copper sulfide based ion-selective membrane in ligand solutions (1990)
    Springer
    Microchimica acta 100 (1990), S. 231-239 
    Details
    ISSN: 1436-5073
    Keywords: precipitate-based ion-selective electrode ; metal buffer solution ; membrane dissolution ; surface characterization ; charge separation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Dissolution of membraneous composite ions of copper sulfide precipitate-based ion-selective electrodes (ISEs) has been measured in various ligand solutions by ICP atomic emission spectrometry and atomic absorption spectrometry from the solution side and by X-ray photoelectron spectrometry on the electrode surface. Asymmetric dissolution, amount of copper dissolved is higher than that of sulfur, was generally observed. The copper dissolution is correlated with the potential response as well as conditional stability constants. The results are discussed in terms of the charge separation caused by the asymmetric dissolution and electrostatic interaction of charged ligands with the space charge on the electrode surface in view of microscopic characterization of ISEs in metal buffer solutions in general. The results were also used to clarify the reason for some discrepancies of complex stability constants obtained by precipitate-based ISEs and other methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01244846
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of metals of low concentration in high purity copper by atomic absorption spectrophotometry (1975)
    Springer
    Microchimica acta 63 (1975), S. 107-116 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Atomarabsorptions-Spektrophotometrie eignet sich zur relativ raschen Bestimmung geringer Metallkonzentrationen in hochgereinigtem Kupfer. Die Genauigkeit ist zufriedenstellend. Die Abtrennung der Matrix ist für die Bestimmung von Kobalt und Eisen nur dann notwendig, wenn deren Konzentration kleiner ist als 0,1%, im Falle des Galliums, Germaniums und Zinns, wenn deren Konzentration unter 1% liegt.
    Notes: Summary AAS is a relatively rapid and convenient method for determining metal components in low concentration in a copper matrix. The accuracy of the method is satisfactory. Separation of the matrix element is necessary in the case of cobalt and iron only if their concentrations are below 0.1%, and in the case of gallium, germanium and tin if they are below 1%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01271527
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  • 4
    Electronic Resource
    Electronic Resource
    Novel bis (crown ether)-based potassium sensor for biological applications (1990)
    Springer
    Microchimica acta 100 (1990), S. 157-168 
    Details
    ISSN: 1436-5073
    Keywords: potassium sensor ; bis-crown-ether ; urine analysis ; blood analysis ; liquid membrane ; flow-injection analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Based on structure-selectivity studies on bis-benzo-crown ether derivatives, 2,2′-bis[3,4-(15-crown-5)-2-nitrophenylcarbamoxymethyl]tetradecane (BME-44) was designed and synthesized. The performance characteristics of this new, highly lipophilic ionophore of the group of bis-nitrobenzo-15-crown-5 derivatives with urethane linkage when used in liquid membrane electrodes are evaluated with special regard to the requirements of biological and clinical applications. Potentiometric steady-state and flow-through dynamic data are presented to prove the sensor capabilities for clinical and physiological potassium determinations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01244839
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Amperometric measurements with ion-selective electrode membranes in a flow system (1990)
    Springer
    Microchimica acta 100 (1990), S. 217-224 
    Details
    ISSN: 1436-5073
    Keywords: flow injection analysis ; ion-selective electrodes ; amperometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Calcium and salicylate sensitive electrode membranes based on plasticized PVC were used for selective amperometric detection in a flow injection system. The peak current was found to depend linearly on concentration and the working range extended well below the potentiometric detection limit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01244844
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  • 6
    Electronic Resource
    Electronic Resource
    Conductance studies with use of an oscillometric detector (1992)
    Weinheim : Wiley-Blackwell
    Electroanalysis 4 (1992), S. 629-634 
    Details
    ISSN: 1040-0397
    Keywords: Conductancc ; oscillometric detector ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: By comparing calculated and experimental data, the accuracy of the assumed equivalent circuit of the oscillometric microcell was proved. The cell parameters were defined and can be used to characterize the cell and to establish the range of its applicability. The correlation between the output voltage of the oscillator and the sample concentration was studied in the case of the measuring principle applied (measurement of quality factor Q). A relationship was derived for describing the dependence of the analytical signal on the concentration, which enabled the factors influencing the sensitivity to be determined. All these studies served to optimize the cell geometry and oscillator circuit.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140040605
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  • 7
    Electronic Resource
    Electronic Resource
    Selective biocatalytic measuring cell for flow injection analysis (1993)
    Weinheim : Wiley-Blackwell
    Electroanalysis 5 (1993), S. 277-281 
    Details
    ISSN: 1040-0397
    Keywords: Flow detector ; Biosensor ; Glucose ; Ethanol ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A flow-through measuring cell developed for flow injection analysis (FIA) measurements is described. The cell works detecting amperometrically the hydrogen peroxide formed in an enzyme-catalyzed oxidation reaction of different substrates. The electrode consists of a thin, hollow dialysis fiber introduced into the flow analysis channel, an enzyme solution film pumped inside the fiber, and a cellulose acetate protective layer-coated thin platinum wire-base sensor housed inside the hollow fiber. The measuring cell for two different model compounds, glucose and ethanol, was well applicable for the concentration determinations in small volume solution aliquots. Important advantages of the cell are its versatility and its easy activation for measurements.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140050403
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  • 8
    Electronic Resource
    Electronic Resource
    Analytical performances of lipophilic diamides based alkaline earth ion-selective electrodesDedicated to the memory of Prof. Wilhelm Simon. (1993)
    Weinheim : Wiley-Blackwell
    Electroanalysis 5 (1993), S. 781-790 
    Details
    ISSN: 1040-0397
    Keywords: Alkaline earth ions ; Lipophilic diamides ; Ion selective electrodes ; Potentiometry ; Diamides ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Based on complex chemical considerations, lipophilic diamide derivatives have been designed and synthesized as ionophores for liquid membrane electrodes. The structure-selectivity studies revealed that the majority of the ligands exhibit calcium ion selectivity, except the compound bis-N,N-dicyclohexyl-malonamide. The latter has an almost equal selectivity for Ca2+ and Mg2+ and sufficiently rejects sodium ions, thus it lends itself to water hardness measurements.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140050911
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