Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    An investigation of gas chromatography with atomic emission detection for the determination of empirical formulas (1990)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 13 (1990), S. 499-506 
    Details
    ISSN: 0935-6304
    Keywords: Capillary gas chromatography ; Atomic emission detection ; Qualitative analysis ; Response factors ; Empirical formula ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The atomic emission detector (AED) is a valuable tool for the identification of unknowns in complex mixtures. To the extent that elemental response factors are independent of compound structure, gas chromatographic results allow calculation of atomic ratios for unknown compounds. In favorable cases, empirical formulas can be found. An algorithm for automated calculation of empirical formulas for all the peaks in a chromatogram has been developed. When finite accuracy prevents an exact determination of empirical formulas, the algorithm gives a list of all formulas for each compound which are compatible with the user-defined limits.Examples are given of calculations for fatty acid methyl esters, substituted phenols, and pesticides. Analyses of volatile pollutants and polychlorinated biphenyls reveal a nonlinearity for hydrogen response, and an interference of chlorine on hydrogen. A lubricating oil analysis is used to illustrate the identification of unknowns.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240130711
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Selective detection of volatile nickel, vanadium, and iron porphyrins in crude oils by gas chromatography-atomic emission spectroscopy (1991)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 14 (1991), S. 110-116 
    Details
    ISSN: 0935-6304
    Keywords: Atomic emission detection ; Analysis of metalloporphyrins ; Selective GC detection of metals ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This report describes the selective detection of volatile nickel, vanadium, and iron metalloporphyrins in crude oil samples. An atomic emission detector (AED) was used for simultaneous detection of these metals using the Ni 301.2 nm, V 292.4 nm, and Fe 302.1 nm emission lines. Detection limits for these metals range from 0.05 to 5 pg/sec. The presence of volatile forms of these metals in several crude oil samples has been confirmed.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240140208
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Determination of multiple selenium stable isotope tracers by inductively coupled plasma mass spectrometry (1992)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 21 (1992), S. 473-478 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Inductively coupled plasma mass spectrometry with hydride generation was used for the determination of Se stable isotope tracer enrichment in standard solutions and biological materials. Up to three enriched isotopes, 76Se, 77Se and 82Se, were determined, while 78Se served as the reference isotope. Tracer enrichment was linearly determined with or without simultaneous additions of two other Se stable isotope tracers. Multiple additions of enriched 77Se and enriched 82Se at the low levels required for in vivo tracers were accurately determined in the presence of a much greater addition of enriched 76Se (for isotope dilution analysis) in spite of the significant 77Se and 82Se impurities introduced with the enriched 76Se. Detection limits for Se stable isotope tracers were sufficient to determine up to a 200-fold dilution of tracer following an initial tracer enrichment equivalent to 10% of the mass of the natural Se pool.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200211002
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    High-performance anion-exchange chromatography coupled with mass spectrometry for the determination of carbohydrates (1992)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 21 (1992), S. 397-407 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Methodology has been developed to couple high-performance anion-exchange chromatography (HPAE) with mass spectrometry utilizing the ion spray liquid chromatography/mass spectrometry (LC/MS) interface. Anion micro-membrane suppression (AMMS) has been used to remove the high concentrations of NaOH and NaOAc (10-400 mM total [Na+]) necessary for the separation of mixtures of monosaccharides and oligosaccharides. Post-suppressor addition of CH3CN/H2O solutions containing NH4OAc or LiOAc provided low-nanomole detection of the monosaccharides by selected ion monitoring of the cationized adducts. Maltooligosaccharide mixtures (three to seven residues) were separated and detected by the HPAE/AMMS LC/MS system in the full-scan mode. Low declustering potentials (35 V) in the LC/MS API source afforded intact singly and doubly charge ammoniated and diammoniated adducts of the sugars. Higher declustering potentials (65 V) produced abundant fragmentation of the ammoniated adducts. The corresponding lithiated and dilithiated species produced intact molecule ion species at higher declustering potentials. The endo H-released oligomannose species from RNase B were determined by the HPAE/AMMS LC/MS system as ammoniated adducts and resulting fragment ions with a high declustering potential (95 V) in the full-scan mode.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200210806
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...