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  • 1
    Electronic Resource
    Electronic Resource
    The GC separation of C2-naphthalene isomers using cyclodextrins and crown ethers (1992)
    Springer
    Chromatographia 34 (1992), S. 163-165 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Cyclodextrins ; Crown ethers ; Dimethylnaphthalene isomer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The twelve structural C2 isomers of naphthalene are resolved on a single capillary column using α, β, or γ cyclodextrin as the stationary phase. A change in elution order is seen upon going from α to β and then γ cyclodextrin which can be related to the size of the cyclodextrin cavity and the stereochemical fit of the isomer. A crown-ether column and a liquid-crystal column were found to be unable to separate all of the isomers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02276131
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  • 2
    Electronic Resource
    Electronic Resource
    The separation of hydrogen and deuterium homologues by inclusion gas chromatography (1992)
    Springer
    Chromatographia 34 (1992), S. 457-460 
    Details
    ISSN: 1612-1112
    Keywords: Inclusion gas chromatography ; Hydrogen/deuterium homologues ; Crown ethers ; Cyclodextrins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Two types of inclusion complex forming compounds, crown ethers and cyclodextrins, were investigated for their ability to separate hydrogen and deuterium homologues. A number of different crown ethers, 15-crown-5, 18-crown-6 and 24-crown-8, as well as examples of α, β and γ cyclodextrins were evaluated with ten homologues. The size of the inclusion cavity was found to be the major factor affecting separation although other factors such as cavity environment and cyclodextrin ring substituents also play a role in the separation process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02290236
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  • 3
    Electronic Resource
    Electronic Resource
    Concentration of volatile organics in aqueous solutions on uncoated capillary columns and their thermal desorption (1990)
    Springer
    Chromatographia 29 (1990), S. 523-529 
    Details
    ISSN: 1612-1112
    Keywords: Trace organics ; Aqueous solutions ; Concentration ; Thermal desorption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A novel technique for the analysis of volatile trace organics in aqueous solutions has been developed. Concentration of organics is performed by passage of the solution being analysed through uncoated hydrophobic capillaries as previously reported. The concentrated organics are then thermally desorbed into a cold trap and subsequently analysed by gas chromatography. The water vapor being coeluted during desorption is selectively removed by the use of a membrane dryer. Quantitative analysis of trace organics in aqueous samples has been successfully carried out in this manner.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02261216
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  • 4
    Electronic Resource
    Electronic Resource
    Rapid concentration of organics from aqueous solutions through uncoated capillary columns: A new approach to purification and ultratrace analysis (1986)
    Springer
    Chromatographia 21 (1986), S. 19-23 
    Details
    ISSN: 1612-1112
    Keywords: Concentration effects ; Uncoated capillary columns ; Trace organics ; Large aqueous volumes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A new technique has been developed for the concentration of organics in aqueous solutions. Volumes greater than 100 ml can be utilized in this system, which previously could not have been done without a distillation or solvent extraction procedure. The method is based on the passage of the solution through uncoated capillary columns of various materials such as polyethylene, copper, aluminum, nickel, and many other metal and/or polymer columns of different dimensions. It is possible to achieve trace level analysis at the ppb to ppt level without the interferences inherent in other existing methods. The purification of solvents has been successfully demonstrated in this preliminary study, and will be discussed along with our suggestions for future investigations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02310589
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