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  • Articles  (2)
  • Organic Chemistry  (1)
  • calibration  (1)
  • 1995-1999  (2)
  • 1996  (2)
  • 1
    Electronic Resource
    Electronic Resource
    A calibration model to overcome non-spectral interferences in flame atomic absorption spectrometry (1996)
    Springer
    Microchimica acta 124 (1996), S. 1-12 
    Details
    ISSN: 1436-5073
    Keywords: FAAS ; calibration ; standard addition ; matrix effects ; Fe determination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A calibration model has been developed in order to overcome matrix effects in atomic absorption measurements. The model uses two independent variables for analyte quantification (the amount of the sample and the amount of analyte added). The dependent variable is the absorbance measured. The method also allows matrix interferences to be controlled without prior knowledge of matrix composition. The method is applied to iron determination by FAAS in the presence of large amounts of copper. Direct calibration and standard addition are also performed in order to compare them with the new empirical model. Results show that the error in iron determination could be −42% when direct calibration is applied and +10% when the standard addition method is used, whereas the proposed model decreases the error to −20%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01244951
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  • 2
    Electronic Resource
    Electronic Resource
    A Generalized Solvent Basicity Scale: The Solvatochromism of 5-Nitroindoline and Its Homomorph 1-Methyl-5-nitroindoline (1996)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1996 (1996), S. 1785-1794 
    Details
    ISSN: 0947-3440
    Keywords: Solvent basicity scale ; Solvent effects ; Solvatochromism ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A total of 202 organic solvents and the gas phase were placed on a solvent basicity scale for hydrogen bond acceptor based on parameter SB. The value of such a parameter can readily be determined from the UV/Vis spectrum for an appropriate acid probe (5-nitroindoline) (NI) and its non-acid homomorph (1-methyl-5-nitroindoline) (MNI). The proposed scale can advantageously substitute the more widely used solvent scales such as Gutmann's donor number (DN), the Koppel-Palm B(MeOD) scale, and the Taft-Kamlet β scale. While data for the proposed scale are derived only from electronic transitions, they are accurately descriptive of solvent basicity in both spectroscopy (UV/Vis, IR and NMR) and miscellaneous chemical areas (thermodynamic, kinetics, and electrochemistry).
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199619961112
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