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  • Aldehydes  (2)
  • Alkali flame detection  (1)
  • Graphitized carbon black  (1)
  • 1
    Digitale Medien
    Digitale Medien
    An experimental method for testing the solvophobic theory by using graphitized carbon black in GC and LC (1982)
    Springer
    Chromatographia 16 (1982), S. 330-335 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Liquid Chromatography ; Solvophobic theory ; Solvent effect ; Graphitized carbon black
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary The net solvent effect for several solute-solvent pairs has been calculated by using the solvophobic approach for describing the liquid chromatographic process. For the same solutes and solvents the net solvent effect has been experimentally measured by using graphitized carbon black columns in GC and HPLC. A comparison between the measured and calculated values made in terms of normalized free energy changes, indicates that the solvophobic theory is fairly adequate for predicting the sequence of solvent strength and provides a comprehensive explanation of the various interactions occurring in reversed-phase LC. Aγ critical discussion of the deviations of the theory from the experimental data is also presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02258932
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  • 2
    Digitale Medien
    Digitale Medien
    Determination of low boiling aldehydes in air and exhaust gases by using annular denuders combined with HPLC techniques (1987)
    Springer
    Chromatographia 23 (1987), S. 829-834 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Column liquid chromatography ; Aldehydes ; Annular denuder ; Environmental analysis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary An improved procedure for the HPLC determination of C1−C3 aldehydes in environmental samples is described. These air pollutants are quantitatively collected on annular denuders coated with 2,4-Dinitrophenylhydrazine and analyzed as hydrazone derivatives by HPLC with UV absorbance and voltammetric detection. Collection efficiencies of aldehydes are reported and compared with other available methods. Practical examples of the application of the method are given.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02311408
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  • 3
    Digitale Medien
    Digitale Medien
    Preparation and performances of small bore columns packed with reversed-phase materials and their use for the evaluation of air pollutants (1987)
    Springer
    Chromatographia 23 (1987), S. 803-810 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Column liquid chromatography ; Small-bore packed columns ; Air pollutants ; PAH, nitro and oxy-PAH ; Aldehydes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary The preparation of small bore columns (1 mm i.d.) packed with reversed-phase materials is described. High efficiency (Hmin=2 dp), coupled with a small C term (0.005 sec) have been obtained so that high speed can be combined with sufficient resolution for the separation of complex organic mixtures. These columns have been used for the separation of air pollutants dispersed in different matrices (air, particulate matter and rain water). Practical applications include the determination of aldehydes in air and emission samples, PAHs, nitrated and oxygenated PAHs in dust sampled from the stack of an industrial emission or collected in a urban area and the analysis of organic components dissolved in rain water collected at a rural site. Specific detection of these pollutants has been achieved by connecting small bore columns to UV absorbance, voltammetric and fluorimetric detectors. Mass spectra of some specific components have been recorded using the off-line technique.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02311403
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  • 4
    Digitale Medien
    Digitale Medien
    Determination of nitrated-polyaromatic hydrocarbons (nitro-PAHs) in environmental samples by high resolution chromatographic techniques (1984)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 389-397 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Low and high resolution liquid chromatography ; Gas chromatography ; Capillary columns ; Alkali flame detection ; Chemical ionization mass spectrometry ; Nitro-PAHs ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: An analytical procedure is described for the fractionation of organic compounds present in environmental samples and the determination of nitro polyaromatic hydrocarbons (nitro-PAHs). Both low and high resolution liquid chromatography are employed for the prefractionation of the soluble organic fraction (SOF) extracted from particulate matter or gaseous pollutants collected on adsorption traps. High resolution gas chromatography is used to analyze four fractions containing alkanes, PAHs, nitro-PAHs, and other polar PAHs. Nitrogen-containing species are separated by GC and detected specifically using an alkali flame (NPD) detector. Flame ionization (FID) detection, GC-MS of positive ions, and negative ion chemical ionization MS of the whole fraction is used for the identification and quantitation of the various components. The composition of SOF extracted from particulate matter emitted from diesel exhausts is elucidated and a large number of nitro-PAHs identified by the combination of the various techniques.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240070709
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