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  • 1
    Electronic Resource
    Electronic Resource
    Adsorptive stripping voltammetry of Ni(II) using fast linear sweeps (1988)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 332 (1988), S. 787-790 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Nickel was determined as bis-(dimethylglyoximato)-nickel(II) by fast cathodic linear sweep voltammetry with a rate of 10 V s−1 after adsorption on a static mercury electrode. The peak width at half-height was 60 mV. For determinations down to 1 ppb of Ni(II), only 40 s accumulation time were required without accelerating measures like stirring or potential application. Resolution and sensitivity were thus similar to differential pulse voltammetry but the duration of a measuring cycle was only 45 s (40 s accumulation, 80 ms for sweep and 5 s for readout). The method was tested with 2 industrial waste water samples and urine. The direct determination of Ni(II) in urine failed, whereas it was possible in the waste water. Concurrent adsorption was the main interference.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01129776
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  • 2
    Electronic Resource
    Electronic Resource
    Hydrogen Isotope Effect on the Isomerization of Peroxynitrous Acid (1998)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 81 (1998), S. 1201-1206 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The kinetics of isomerization of deuterium and hydrogen oxoperoxonitrate, ONOOD and ONOOH, respectively, to trioxonitrate(1-), NO3-, and a deuteron or proton have been studied. Analysis of the pH-rate profiles result in a normal equilibrium isotope effect (KH/KD) of 3.3. The kinetic deuterium isotope effect for the isomerization reaction is 1.6 ± 0.2 between 5 and 55°. The activation enthalpies of isomerization of ONOOD and ONOOH are identical within the error of the measurement, 86.2 ± 0.5 and 86.5 ± 0.5 kJmol-1, respectively. A secondary kinetic isotope effect of 1.6 is compatible with a mechanism of isomerization where the terminal peroxide O-atom shifts to the N-atom.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19980810530
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    Paper (German National Licenses)
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