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  • Artikel  (20)
  • Gas chromatography
  • Wiley-Blackwell  (20)
  • 2015-2019
  • 1985-1989  (20)
  • 1988  (20)
  • 1
    Digitale Medien
    Digitale Medien
    Quantitative determination of airbone C1- and C2-halocarbons by GC/ECD (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 51-56 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Air analysis ; Airborne halocarbons ; Chlorocarbons ; Electron capture detector ; Forest decline ; Halocarbons ; Thermodesorption ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The atmospheric levels of C1- and C2-halocarbons are determined by trapping on an adsorbent, thermodesorption, cryofocussing, gas chromatographic separation on a thick-film capillary, and electron-capture detection. The various aspects relevant to reliability and accuracy are discussed, such as type of adsorbent, range of detector response, and levels of contaminants present in blanks. These in turn have implications for optimum sample size and amount of adsorbent. The adopted method is suitable for routine analysis of airborne halocarbons at variable locations. The air concentrations of C1- and C2-halocarbons on the ground of mountain forests are similar to those in cities, a fact which supports the hypothesis that chlorocarbons are involved in the initiation of a phytotoxicological phenomenon commonly referred to as “forest decline”.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240110114
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  • 2
    Digitale Medien
    Digitale Medien
    CGC analysis of the essential oils of citrus fruits on 100 μm i.d. columns (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 73-75 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; 100 μm i.d. capillary column ; High speed separations ; Lemon oils ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Narrow bore columns (100 μm) have successfully been applied in the analysis of commercial lemon oils. On these columns, high resolution is obtained in a short analysis time. Different Brazillian lemon oils are characterized qualitatively and quantitatively.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240110119
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  • 3
    Digitale Medien
    Digitale Medien
    Determination of soil fumigants in air using tandem capillary gas chromatography after charcoal trapping (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 106-110 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Tandem capillaries ; Charcoal trapping ; Soil fumigants ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Soil fumigants, like 1,3-dichloropropene and metham-sodium (forming methyl isothiocyanate) diffuse into the atmosphere, thus presenting a hazard to people in the surroundings. A method is described in which a large volume (50 μl) of extractant, used to desorb the compounds from charcoal, is injected into a GC, equipped with two capillary columns. By way of Deans switching, the solvent is separated from the compounds of interest. Modification of a GC sampler makes unattended analyses possible.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240110127
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  • 4
    Digitale Medien
    Digitale Medien
    The preparation of immobilized stationary phase fused silica capillary columns with OV-1701-vinyl deactivation (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 157-161 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary columns ; Immobilization ; Deactivation ; OV-1701-vinyl ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A new simplified method was developed for the preparation of immobilized stationary phase fused silica capillary columns coated with OV-1-vinyl, SE-54, and OV-1701-vinyl. This methodology includes the application of the moderately polar stationary phase OV-1701-vinyl as a surface deactivation agent that may also participate in the dicumyl peroxide initiated free radical immobilization process. Practical details of the procedure are presented and applications of the laboratory-produced columns are illustrated with capillary gas chromatographic separations of standard mixtures. Possible contributions of the OV-1701-vinyl deactivation layer to both crosslinking and surface bonding in the immobilization process are discussed.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240110203
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  • 5
    Digitale Medien
    Digitale Medien
    PoraPLOT Q: A porous layer open tubular column coated with styrene-divinylbenzene copolymer (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 162-167 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary columns ; PLOT columns ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A porous polymer is deposited on the inner wall of fused silica capillary columns. The retention characteristics of this porous polymer were evaluated and found to be comparable with Porapak Q. The porous polymer has a high retention volume which enables the separation of permanent gases at ambient temperatures or higher. The hydrophobic character of the porous polymer allows the injection of water containing samples without changing retention due to adsorption of water. The inertness of the porous polymer allows the elution of a range of apolar and polar compounds. The maximum temperature of the porous polymer was estimated to be 250°C. With this new type of capillary column, high resolution separations are obtained in combination with short analysis times.
    Zusätzliches Material: 11 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240110204
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  • 6
    Digitale Medien
    Digitale Medien
    Capillary gas chromatography of the terpenic fraction of Juniperus communis L. Black, Green, Berry, and Leaf Extracts (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 218-220 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary column ; Essential oil ; Juniperus communis L ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240110219
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  • 7
    Digitale Medien
    Digitale Medien
    Comparison of thick film capillaries with packed columns from the point of view of loadability in combination with high resolving power (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 271-277 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Thick film capillary columns ; Packed columns ; High pressure packed columns ; Loadability ; Open tubular columns with large diameter ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The present paper compares the potential of high pressure packed column gas chromatography, with a particle size in the range of 30-80 μm and conventional packed column GC. with that of thick film capillaries for obtaining the maximum loadability at a given performance in efficiency and speed of separation. An alternative treatment, discussing the maximum efficiency of the three column types at normalized loadability and speed of separation is given. Known and established relationships describing plate height, loadability, and linear velocity are used to arrive at the said comparisons. The conclusion of the paper indicates a reconsideration of packed column GC for particular types of analyses where large amounts or high concentrations are required in the detection step.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240110310
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  • 8
    Digitale Medien
    Digitale Medien
    Preparation of persilanized glass capillary columns coated with the immobilized polyethylene glycol phase superox-4 (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 491-495 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary columns, glass ; Superox-4, stationary phase ; Persilanization by DPTMDS ; Immobilization by DCUP ; Irganox 1010, antioxidant ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240110612
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  • 9
    Digitale Medien
    Digitale Medien
    Gas chromatographic determination of acetic acid (in the hydrolysis of 1,1,1-trichloroethane) by direct aqueous injectionAbiotic Transformation of Halogenated Organic Compounds - Part III. (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 610-612 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Large diameter open tubular column ; Water analysis ; Chlorinated hydrocarbons ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240110816
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  • 10
    Digitale Medien
    Digitale Medien
    Specific retention volumes, retention indices, and family-plot regressions of aliphatic, alicyclic, and aromatic hydrocarbon solutes with OV-101 poly (dimethylsiloxane) stationary phase (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 649-660 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Homologized series ; Retention volumes ; Family behavior ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240110908
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  • 11
    Digitale Medien
    Digitale Medien
    Analysis of nitropyrenamines and methylated nitropyrenamines via gas chromatography-negative ion atmospheric pressure ionization mass spectrometry (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 661-663 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Mass spectrometry ; Capillary GC ; Aminonitropyrene ; Nitropyrenamine ; Nitro-PAHs ; Atmospheric pressure ionization ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240110909
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  • 12
    Digitale Medien
    Digitale Medien
    Determination of gas phase nicotine and 3-ethenylpyridine, and particulate phase nicotine in environmental tobacco smoke with a collection bed - capillary gas chromatography system (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 775-782 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Environmental tobacco smoke ; Sampling ; Tenax ; Nicotine, 3-Ethenylpyridine, Particulate nicotine ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A combined sampling and analysis technique for the determination of gas phase nicotine and 3-ethenylpyridine, and of particulate phase nicotine in environmental tobacco smoke with capillary gas chromatography is reported. The major advantage of the technique is that all of the collected particulate phase material is analyzed by thermal desorption of the collected material rather than by analysis of only a fraction of the sample extracted from the collection medium. A Teflon filter microtube is used to collect particulate phase nicotine. This microtube is follwed by a small Tenax sorbent bed to collect gas phase nicotine and 3-ethenylpyridine. After sampling, the Teflon filter is transferred to a clean glass tube and the tube becomes an insert for a modified packed column injector port where the material collected on the filter is heat desorbed to a cold capillary tubing trap. Gas phase nicotine and 3-ethenylpyridine are also transferred from the Tenax to the GC column by thermal desorption from the Tenax sorbent bed. Gas phase nicotine and 3-ethenylpyridine, and particulate phase nicotine are each determined by GC analysis of the desorbed material. Nicotine and 3-ethenylpyridine are quantitated by the use of external standards. This technique is straightforward and can be used for semi-real time determination of both gas and particulate phase compounds in environmental tobacco smoke. The results obtained by this technique compare well with those obtained by sampling with annular diffusion denuders.
    Zusätzliches Material: 13 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240111106
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  • 13
    Digitale Medien
    Digitale Medien
    Gas chromatography of plasma amino acids using a wide bore column: Comparison with packed and capillary columns (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 229-233 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Fused-silica capillary ; Wide bore glass capillary ; Packed column ; Plasma amino acids ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A procedure is described in which a wide bore glass capillary column is used as an alternative to the more traditional packed column in the analysis of amino acid levels in plasma. The coefficients of variation for all amino acids (with the exception of aspartic acid) were better than 11% with recoveries ranging from 81% to 122%. The data are compared with the corresponding results obtained using a packed column and show significant differences (p 〈 0.005) between values for glycine, serine, isoleucine, proline, methionine, aspartic acid, phenylalanine, and lysine. A similar comparison between results from the wide bore and the fused-silica open tubular (FSOT) column shows better agreement. Adjustment of chromatographic conditions for the wide bore analysis yields results in good agreement with those from FSOT analysis but which still differe significantly from the backed column data.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240110303
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  • 14
    Digitale Medien
    Digitale Medien
    Evaluation of fused-silica capillary columns for GC/ECD analysis of chlorinated hydrocarbons listed in EPA method 8120 (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 234-241 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Fused-silica capillary column ; Chlorinated hydrocarbons ; EPA Method 8120 ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Four mega-bore, one wide-bore, and one narrow-bore fused-silica capillary columns were evaluated for their applicability to the GC/ECD analysis of 22 chlorinated hydrocarbons, some of which are currently targeted by EPA Method 8120. No one column can resolve all 22 compounds investigated here. Four compounds (two pairs) are coeluting on the SPB-35, DB-210, DB-WAX, and DB-519 fused-silica capillary columns, five compounds (two groups) are coeluting on the DB-1301 fused-silica capillary column, and ten compounds (five pairs) are coeluting on the SPB-5 fused-silica capillary column. The analysis time varies between 30 and 50 min. The order of elution of the chlorinated benzenes seems to depend on their boiling points rather than on the polarity of the liquid phase. The retention times of an additional nine chlorinated toluenes, eight chlorinated xylenes, and five chlorinated naphthalenes are also reported. Electron capture detector linearity is reported for the DB-210 fused-silica capillary column. Five brominated compounds were investigated as possible internal standards for Method 8120.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240110304
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  • 15
    Digitale Medien
    Digitale Medien
    OH-terminated cyanopropyl silicones (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 256-263 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Fused silica capillary columns ; Cyanopropyl stationary phases ; OH-terminal groups ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Due to their high polarity and unique selectivity, cyanopropyl silicones are basic stationary phases for high resolution capillary gas chromatography. Different OH-terminated cyanopropyl silicones, containing a high cyanopropyl content, were synthesized and chromatographically evaluated. Special attention was paid to the degree of immobilization of the phases in FSOT columns. Depending on the problem at hand, a choice has to be made between immobilization and maximum selectivity.
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240110308
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  • 16
    Digitale Medien
    Digitale Medien
    Simple and versatile method for connecting fused silica and glass capillaries (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 337-338 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Connector ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240110408
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  • 17
    Digitale Medien
    Digitale Medien
    Computer controlled micropreparative isolation and enrichment from GC capillary columns and subsequent sample handling (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 449-456 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary columns ; Micropreparative enrichment ; Volatile components ; Micro sample handling ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: This paper describes a computerized system for micropreparative enrichment of components from a mixture being separated on a capillary column. All electronic components are commercially available. Programming was performed in BASIC so that users can easily adapt the program to their own special needs.The enrichment procedure is based on a repetitive absorption of eluting compounds after separation from a capillary column, by sucking them through an absorption tube mounted at the outlet splitter. In order to perform this procedure reliably, the system searches for reference peaks which can stem from componetns of the mixture or from deliberately added reference compounds. Use of error diagnostics prevents contamination of the collected fractions in case of system failures. Optimization is easily performed during a supervised GC run in a semiautomatic mode. Using the function keys of the computer, the operator can adjust injection volume, measure the base line drift at any retention time, and perform reference peak allocation and peak switching until optimal conditions have been found.The system presented has been in operation for several years in our laboratory where, in some cases, the mixture had to be injected onto the capillary column over 500 times to obtain the amount of pure component (10-1000 μg) necessary for NMR structure elucidation. However, recording of meaningful spectra of such small amounts requires special precautions in sample handling. This technique can also be applied for sample recovery after analysis by non-destructive elucidation methods or by chemical microreactions without loss.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240110605
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  • 18
    Digitale Medien
    Digitale Medien
    Reverse search spectrum comparison and elution profile analysis in GC-MS data set (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 585-587 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Mass spectrometry ; Spectrum comparison ; Peak shape ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240110806
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  • 19
    Digitale Medien
    Digitale Medien
    Methyl p-hydroxyphenyllactate: Identification in rat liver extracts (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 605-607 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Mass spectrometry ; Methyl p-hydroxyphenyllactate ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240110814
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  • 20
    Digitale Medien
    Digitale Medien
    Pheromones in Nanogram Quantities: Structure Determination by Combined Microchemical and Gas Chromatographic Methods [New Analytical Methods (35)] (1988)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 27 (1988), S. 460-478 
    Details
    ISSN: 0570-0833
    Schlagwort(e): Pheromones ; Analytical methods ; Gas chromatography ; Microanalysis ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: What can a chemist do with a few nanograms of valuable organic substance, pure or impure? The answer may be, a great deal. Its components may be quantified, separated, isolated, degraded, derivatized, extracted by solvent partition, as well as the more obvious recording of their mass spectra. Provided a substance is not contaminated by large quantities of solvent, manipulations are possible without much loss or dilution. Necessity is the mother of invention. The examples given in this review show what can be accomplished today in nanochemistry and should act as a stimulus to direct the scientist to discover other applications appropriate to his needs and his circumstances. The examples are largely taken from the field of insect chemistry, but their general applicability is emphasized. This review illustrates how gas chromatography and reaction gas chromatography, alone or combined with mass spectrometry are potent tools in the hands of the chemist to deduce the unique structure of volatile organic substances available only in nanogram quantities.
    Zusätzliches Material: 17 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/anie.198804601
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