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Adsorptive stripping voltammetry of Ni(II) using fast linear sweeps (1988)

Kissner, Reinhard

Springer

Fresenius' Zeitschrift für analytische Chemie 332 (1988), S. 787-790

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ISSN: 1618-2650

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: 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.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01129776

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Digitale Medien

Hydrogen Isotope Effect on the Isomerization of Peroxynitrous Acid (1998)

Padmaja, Sarojini ; Kissner, Reinhard ; Bounds, Patricia L. ; [weitere]

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 81 (1998), S. 1201-1206

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ISSN: 0018-019X

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: 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.

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/hlca.19980810530

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