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  • 1
    Electronic Resource
    Electronic Resource
    Adsorption of aliphatic, alicyclic, and aromatic hydrocarbons on poly(ethylvinylbenzene-divinylbenzene) adsorbent at from effective zero to finite adsorbate surface coverage (1986)
    s.l. : American Chemical Society
    Analytical chemistry 58 (1986), S. 1395-1404 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00298a028
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  • 2
    Electronic Resource
    Electronic Resource
    Determination of40K and137Cs concentration in selected honey samples (1995)
    Springer
    Journal of radioanalytical and nuclear chemistry 199 (1995), S. 465-469 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Seventeen honey samples collected at different sites during 1992 have been measured using the method of γ-spectroscopy. Measurements were performed by a low background high purity germanium spectrometer of a relative efficiency of 14.5% and an energy resolution of 1.7 keV. Using natural γ-ray sources to determine efficiency, it has been shown that out of 17 samples of natural honey only two (of meadow type) have specific activity of137Cs greater than 0.5 Bq kg−1. The remaining samples have the same137Cs concentrations as before May, 1986. Predominant activity in all samples comes from the40K radionuclide, indicating natural honey.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02164633
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  • 3
    Electronic Resource
    Electronic Resource
    Dynamic adsorption of uranium(VI) and zirconium(IV) on silica gel (1992)
    Springer
    Journal of radioanalytical and nuclear chemistry 158 (1992), S. 79-90 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Adsorption of uranium(VI) and zirconium(IV) from aqueous nitric acid solution on silica gel has been investigated under dynamic conditions. The influence of temperature, nitric acid concentration (pH), and solution flow rates was studied. If the nitric acid concentration in the solution is higher than 0.05 mol/l, then it is possible to achieve separation of uranium(VI) and zirconium(IV) by passing the solution through a column filled with silicagel.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02034775
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  • 4
    Electronic Resource
    Electronic Resource
    An inverse gas chromatographic study of the adsorption of alkanes on hydroxyapatite (2000)
    Springer
    Journal of materials science 35 (2000), S. 2825-2828 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Saturated alkanes adsorption on synthetic well-crystallized hydroxyapatite was studied by the inverse gas chromatography method, at zero coverage. Hydroxyapatite was prepared from Ca(OH)2 and H3PO4 aqueous solutions by a slow titration technique. The powder was characterized by XR diffraction, surface area measurement, and chemical analysis. Adsorption of saturated alkanes was investigated in the temperature range 338–353 K, using a flame ionization detector, and nitrogen as a carrier gas. The gas/solid partition coefficients were calculated from the retention data as well as the standard thermodynamic functions of adsorption, ΔH0 d, ΔS0 a and ΔG0 a. Linear relationships between lnK and 1/T and between ΔG0 a and the number of carbon atoms in saturated alkanes were observed. The dispersive component of the surface free energy was calculated for the investigated temperature region. A possible analytical application of hydroxyapatite to n-alkanes separation is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004795019433
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of boric acid concentration on silicon carbide morphology (1995)
    Springer
    Journal of materials science 14 (1995), S. 1052-1054 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00258162
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  • 6
    Electronic Resource
    Electronic Resource
    Chromatographic and adsorptive properties of mercury sulfide (1980)
    Springer
    Chromatographia 13 (1980), S. 226-230 
    Details
    ISSN: 1612-1112
    Keywords: Gas-solid chromatography ; Adsorption ; Thermodynamics ; Mercury sulfide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The behaviour of mercury sulfide (metacinnabarite) as an adsorbent in gas-solid chromatography was investigated. Adsorption of some aliphatic, alicyclic, chlorimated and aromatic hydrocarbons and acetone is discussed in the light of adsorbate-adsorbent interactions. For the organic compounds used, thermodynamic parameters were determined and discussed in terms of the specific reactions that may take place on the adsorbent surface. Experimental data obtained show that mercury sulfide can be successfully employed as an adsorbent in analytical gas-solid chromatography.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02261877
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  • 7
    Electronic Resource
    Electronic Resource
    A gas chromatographic study of the adsorption of organics on thermally treated clinoptilolite (1989)
    Springer
    Chromatographia 27 (1989), S. 306-310 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Adsorption studies ; Clinoptilolite ; Zeolite
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Adsorption properties of NH4-clinoptilolite, thermally treated at 400, 550 and 650°C, were investigated by gas-solid chromatography. Adsorption of ten hydrocarbons, including aliphatic, alicyclic, chlorinated and aromatic compounds is discussed in the light of adsorbate-adsorbent interactions. The imporatant thermodynamic parameters of adsorption are determined. A detailed discussion is presented on the alteration of the surface properties of NH4-clinoptilolite caused by thermal treatment. Experimental data obtained show that NH4-clinoptilolite treated at 650°C can be successfully employed as a column packing in analytical gassolid chromatography.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02321274
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  • 8
    Electronic Resource
    Electronic Resource
    Adsorption of organic liquids on alkaline earth-metal modified silica (1988)
    Springer
    Chromatographia 26 (1988), S. 324-328 
    Details
    ISSN: 1612-1112
    Keywords: Gas-solid chromatography ; Silica ; Modification ; Adsorption ; Thermodynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Adsorption properties of alkaline earth-metal modified silica beads were investigated by the gas-solid chromatography (GSC) method. Silica beads, obtained from colloidal material, were characterized by their surface areas, crystallinity and amount of sorbed alkaline earth cations. Retentions of several aliphatic, alicyclic, chlorinated, and aromatic compounds were measured in the temperature range from 373 to 453 K. The gas/solid partition coefficients, K5, and the related thermodynamic functions at zero surface coverage were determined. The results show that the specific surface areas of modified silica samples remain practically constant, whereas the modification leads to a decrease of silica surface heterogeneity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02268175
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  • 9
    Electronic Resource
    Electronic Resource
    Thermodynamics of adsorption of organic liquids on Ni-modified solid obtained from collodal silica (1988)
    Springer
    Chromatographia 26 (1988), S. 387-392 
    Details
    ISSN: 1612-1112
    Keywords: Gas-solid chromatography ; Silica modification ; Thermodynamics of adsorption ; Adsorption isotherms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary In order to reduce the well known silica surface inhomogeneity and to get a material suitable for selective chromatographic separations, a modified variety of the material was prepared by a controlled sorption of Ni2+ ions at the solid surface; its adsorption properties were then investigated using the GSC method. Since the starting material was of very high purity, it was possible to follow the influence of Ni2+ ion on the adsorption of various organic liquids, including n-alkanes, cyclohexane, benzene and halomethanes. Adsorption experiments, spanning zero surface coverage and the finite concentration region, were performed in the temperature range from 333 to 443 K. Both the surface activity change resulting from the modification and the possible interactions between the organic substances and the prepared adsorbent were examined using the standard free energy change of adsorption in zero coverage conditions. The adsorption isotherms of all the adsorbates listed were obtained using the Elution by Characteristic Point (ECP) technique and the data were fitted to the BET equation. To get a better insight into the adsorption process in the finite concentration region, the thermodynamic parameters of adsorption were determined and are discussed in terms of surface coverage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02268187
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