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  • 1
    Electronic Resource
    Electronic Resource
    On-column injection in the stopped-flow mode with open-tubular columns (1984)
    Springer
    Chromatographia 18 (1984), S. 234-238 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Open-tubular columns ; On-column injection ; Stopped-flow operation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A simple, inexpensive, on-column injector of the septum moving-needle kind is described for quantitative analysis using open-tubular columsn. when operated in the stopped-flow mode an improvement incolumn efficiency is observed combined wit a diminished tendency to produce split-top peaks, particularly for late eluting peaks. Using electronic integration a relative error of about 2.7% was observed for peaks spanning a wide range of sample concentrations and volatilities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02270556
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  • 2
    Electronic Resource
    Electronic Resource
    Direct analysis of some aroma compounds by gas chromatography with helium ionization detection (1982)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 5 (1982), S. 265-266 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary column ; Helium ionization detector ; Aroma ; Coffee ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240050508
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  • 3
    Electronic Resource
    Electronic Resource
    Simple alternative method for preparing high quality fused silica SE-54 WCOT capillary columns (1983)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 6 (1983), S. 436-440 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, fused silica ; Superox-4 pretreatment, deactivation ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240060807
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  • 4
    Electronic Resource
    Electronic Resource
    Direct determination of pollutants in air by gas chromatograph helium ionization detection (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 188-190 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Helium ionization detector (HID) ; Vinyl chloride ; Sulfur gases ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040413
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  • 5
    Electronic Resource
    Electronic Resource
    Computer comparisons of variables in capillary gas chromatography (1982)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 5 (1982), S. 227-235 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Van Deemter curve ; GC column selection ; GC carrier gas ; Capillary column length ; Capillary column diameter ; Film thickness in capillary columns ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A series of computer-constructed van Deemter curves that permits evaluation of a number of variables in capillary gas chromatography is presented. The graphs permit the comparison of inter-related parameters, including the choice of carrier gas (hydrogen vs helium vs nitrogen), column length (10-100 m), column diameter (0.20, 0.25, 0.32, 0.4 mm), solute partition ratios (0-10), and liquid phase film thickness (0.1, 0.25, 0.5, 1.0 μm). The curves are evaluated, both in terms of the relative magnitude of the optimum average linear carrier gas velocity, and in terms of the significance of the sharpness of the curve.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240050502
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  • 6
    Electronic Resource
    Electronic Resource
    Selective and non-selective sampling from precolumn separations - with emphasis on the sampling of aqueous solutionsPaper based on a poster presented at the Fifth International Symposium on Capillary Chromatography, Riva del Garda, Italy, April 26-28, 1983. (1984)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 4-12 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Immobilized capillary columns ; Aqueous solutions ; On-column injection ; Split injection ; Multidimensional separations ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Various methods of gas chromatographic analysis at high resolution and low detection limits in aqueous solutions are described with regard to sampling techniques, column technology, and the application of coupled pre-columns, also including multidimensional methods. Immobilized polyethylene glycol (Carbowax 20 M) columns have also been produced and used successfully.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240070102
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  • 7
    Electronic Resource
    Electronic Resource
    A universal sample injection system for capillary column GC using a programmed temperature vaporizer (PTV) (1982)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 5 (1982), S. 355-359 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary column ; Sample injection with a programmed temperature vaporizer ; Cold sample injection ; Cold solvent-elimination injection ; Cold split injection ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This article describes the use of a programmed temperature vaporizer injection system which overcomes many of the classical problems associated with other injection techniques employed in capillary GC. The system can be operated in three distinct modes.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240050704
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  • 8
    Electronic Resource
    Electronic Resource
    Measurement of the urinary metabolites of n-hexane, cyclohexane and their isomers by gas chromatography (1981)
    Springer
    International archives of occupational and environmental health 48 (1981), S. 99-106 
    Details
    ISSN: 1432-1246
    Keywords: Urine analysis metabolites ; Gas chromatography ; Hexane ; Cyclohexane ; Biological monitoring
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A gas chromatographic method for analyzing the urinary metabolites of n-hexane (2-hexanol, 2,5-hexanedione, 2,5-dimethylfuran and γ-valerolactone), of 2-methylpentane (2-methyl-2-pentanol), of 3-methylpentane (3-methyl-2-pentanol), and of cyclohexane (cyclohexanol) was developed. Processing of urine and the gas chromatographic conditions are described. The recovery rate of all hexane metabolites, except 2,5-dimethylfuran, ranged between 92 and 100%. The variation coefficient of metabolites determination was between 1.5 and 5%, apart from 2,5-dimethylfuran determination for which the variation coefficient was 15%. The detection limits ranged between 0.2 and 0.7 mg/1 and between 0.05 and 0.1 mg/1 when a packed or capillary column was used. Results obtained from a packed and capillary column are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00405936
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  • 9
    Electronic Resource
    Electronic Resource
    Steroid biochemistry of virilising adrenal tumours in childhood (1984)
    Springer
    European journal of pediatrics 142 (1984), S. 165-169 
    Details
    ISSN: 1432-1076
    Keywords: Adrenal gland neoplasms ; Urine steroids ; Gas chromatography ; Mass spectrometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Steroid excretion in urine of 12 infants with virilising adrenal tumours has been determined using gas chromatography. In six children, (Group A, five female, one male) aged 2.8–5.3 years, very high urinary excretions of 17 oxosteroids (〉40 μmol/24 h) were largely accounted for by dehydroepiandrosterone (DHA). In one of the girls, the pattern of steroids excreted in urine was similar to that of newborn infants, with high excretions of 16-oxygenated derivatives of DHA. The histology of this tumour suggested a neoplasia of fetal-type adrenocortical cells. Very large tumours were found in three of the infants, two of whom have died and one has multiple metastases. From the other three children, small, well-encapsulated adenomas were successfully removed. Six children (Group B), had moderately elevated 17-oxosteroid exrretions (8–17 μmol/ 24 h). In five of these cases (four female, one male) aged 0.8–5 years, 11β-hydroxyandrosterone was a consistently prominent urinary steroid. In one boy, aged 7.7 years, 17-oxosteroid excretion was 15 μmol/24 h and the major steroids in urine were metabolites of pregnenolone. These six children have survived with no clinical evidence of recurrent tumour. The in vivo functional activities of the tumours can be deduced from the different profiles of steroids in urine. These have revealed heterogeneous patterns of steroid biosynthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00442442
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  • 10
    Electronic Resource
    Electronic Resource
    Use of an (n, α) nuclear reaction to study the long-distance transport of boron in trifolium repens after foliar application (1980)
    Springer
    Planta 150 (1980), S. 197-205 
    Details
    ISSN: 1432-2048
    Keywords: Boron ; Foliar nutrition ; Nuclear reactions ; Transport (boron) ; Trifolium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The growth of white clover (Trifolium repens L.) is severely inhibited by boron starvation, but a foliar treatment with boric acid can transitorily alleviate the deficiency symptoms. The 10B(n ,α)7 Li nuclear reaction has been used to study boron transport in the plant after foliar application. More than 98% of the boron supplied remained at the point where it was applied to the leaves, and less than 2% was useful to the growth of the treated plant. This small “efficient” portion of boron was quite mobile. It was distributed to the different parts of the plant, then was transferred from the oldest parts to the newly formed leaves. Physiological and agronomical implications of these data are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00390826
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