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  • 1
    Electronic Resource
    Electronic Resource
    Spectroscopic studies of sorbing fibers using combined elements with multiple attenuated total internal reflection (2000)
    Springer
    Optics and spectroscopy 89 (2000), S. 413-417 
    Details
    ISSN: 1562-6911
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Spectroscopic studies of sorbing devices on the basis of silica capillaries coated by sorbing polymer films are carried out by methods of spectroscopy of multiple attenuated total internal reflection with the use of combined elements of internal reflection. A technique for inspecting and improving the technological process of manufacture of sorbing devices for solid-phase microextraction and subsequent chromatographic analysis of organic compounds is developed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1310710
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  • 2
    Electronic Resource
    Electronic Resource
    Reaction gas chromatography of alkyl halogenides. Optimization of the conversion into alkyl azides (1978)
    Springer
    Chromatographia 11 (1978), S. 720-724 
    Details
    ISSN: 1612-1112
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The central orthogonal composite design methodology is employed to find optimum conditions for the conversion of alkyl halogenides into alkyl azides in a chromatographic system. In spite of the difference in the chemical structure of the starting alkyl halogenides, we have found that there is a similarity in the effect of various factors on the conversion process of alkyl halogenides into the corresponding azides. Conditions have been established which provide 100% conversion of n-butyland isopropyl iodide. Computation of the response functions by the corresponding regression equations permitted us to define a region of optimum conditions common for the primary and secondary propyl- and n-butyl iodides and bromides, as well as for n-pentyl iodide providing for a conversion at least 90–95%. Differences in the relative retention times of the alkyl halogenides and the corresponding azides are sufficient to carry out identification by the peak shift method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02269107
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  • 3
    Electronic Resource
    Electronic Resource
    A modification of the internal normalization method with sample splitting (1976)
    Springer
    Chromatographia 9 (1976), S. 3-9 
    Details
    ISSN: 1612-1112
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The procedure of sending a part of the sample vapor directly to the detector has been proposed earlier. This permits the quantitative determination of any sample component by relating its peak area to that of the total peak. This method represents a modification of the internal normalization method, with sample splitting. The necessary operating conditions and the applicability range of the method are considered. The dependence of the analytical results on the errors of splitting detector response factors and peak area measurements is discussed. Different types of split systems and flow paths have been tested. The possibilities of this method are demonstrated by determining the total amount of paraffins and cycloparaffins in platforming gasolines enriched in aromatics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02270591
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Headspace gas chromatographic determination of aromatic hydrocarbons in natural and waste water (1981)
    Springer
    Chromatographia 14 (1981), S. 699-703 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Headspace analysis ; Aromatic hydrocarbons ; Water analyses
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The possibilities of using headspace analysis of aromatic hydrocarbon traces in aqueous solutions with changing values of the partition coefficients are discussed. A variant of headspace analysis of the simplest aromatic hydrocarbon in natural and waste water is described. It involves two-step gaseous extraction of a sample in vessels of varying volume before and after the equilibrium phase is replaced with a pure gas (air or nitrogen). This method permits to analyse 5–50 ml water samples with benzene and toluene contents varying from the ppb to the ppm range within an error not exceeding 155. The analysis time is about 1.5 h. The presence of non-volatile organic or mineral substances does not influence the determination. This method is unsuitable to heterogeneous systems (aqueous oil emulsions): before carrying out the analysis for the hydrocarbon content these systems have to be homogenized first.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02259458
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    Paper (German National Licenses)
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