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  • 3H  (1)
  • AC-ECD  (1)
  • cobalt  (1)
  • 6-Dichloro-2-acetamidophenyl acetate; 5
  • Springer  (3)
  • Munksgaard International Publishers
  • 1985-1989  (3)
Collection
Publisher
  • Springer  (3)
  • Munksgaard International Publishers
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Hydrobiologia 126 (1985), S. 103-107 
    ISSN: 1573-5117
    Keywords: cobalt ; ultratrace elements ; lake water ; graphite-furnace AA ; chemical analysis ; environmental
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A method is described for determining stable cobalt concentrations in natural lake waters using polarized Zeeman effect graphite furnace atomic absorption spectrometry. The analysis requires small sample volumes, minimal sample pretreatment and preparation and no chelation or solvent extraction procedures. Instrument linearity, per cent cobalt recovery, matrix interferences and the use of the standard additions method are discussed. The increased sensitivity and precision due to Zeeman AA background correction permits precise determination of stable cobalt in the µg.1−1 range.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 96 (1988), S. 11-26 
    ISSN: 1436-5073
    Keywords: electron capture detector (ECD) ; electron oscillation ; AC-ECD ; argon-methane ; non-homogeneous ECD kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The oscillation of electrons—as driven by AC polarization—can be used to extract a high-sensitivity signal from a conventional electron capture detector. For example, hexachloroethane was detected at a hypercoulometric ratio of 2.0 F/mol, down to ca. 60 fg/s (S/N=3) and with a linear range in excess of two orders of magnitude. The change in carrier gas from nitrogen to argon-methane produced the expected order-of-magnitude increase in optimum oscillation frequency. Anab initio simulation of potentials and ion populations in a heterogeneous electron capture system under a high-frequency AC regime provided further insight into the detector's mechanism: Hypercoulometric response is mainly caused by increased cation-electron recombination in the plasma region, owing to a decreased field gradient and an increased cation concentration.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1436-5073
    Keywords: ionization topography ; 3H ; 63Ni ; electron capture detector
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The ion-pair generation rate (ionization topography) in plasmas from63Ni and particularly Ti3H4 foils, as used in electron capture detectors, was measured at room temperature using large, parallel plates of low backscattering ability in nitrogen gas of varying density. For one atmosphere pressure, the fall-off of ion pair formation as calculated from the exponential region equalsN 0·e −0.19d for63Ni andN 0·e −1.4d for3H (whereN 0 is the initial ionization rate immediately adjacent to the foil andd is the distance from the foil in mm). The experimentally measured half ranges (distances from the foil within which 50% of all possible ion pairs are created) are 2.7 mm for63Ni and 0.27 mm for3H. The half ranges calculated from the exponential region where there is less interference from electron backscattering, are 3.7 and 0.5 mm, respectively. The latter values are considered closer to the “true”, unimpeded ionization topography near planar63Ni and3H foils.
    Type of Medium: Electronic Resource
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