caa a22 4500 465746292 CHVBK 20180323111821.0 cr unu---uuuuu 170327e19900101xx s 000 0 eng 10.1007/BF00331390 doi (NATIONALLICENCE)springer-10.1007/BF00331390 Determination of hexacyanoferrate based on its catalytic influence on the oxidation of p-phenylenediamines by iron(III) [Elektronische Daten] [Ulrich Nickel, Brigitte Thormann] Summary: Both hexacyanoferrate(III) and hexacyanoferrate(II) catalyze the oxidation of p-phenylenediamines by iron(III)aq. The rate of this reaction in the presence of a sample with an unknown amount of hexacyanoferrate is compared with the reaction rate of solutions containing well defined concentrations of this substance. In this way, hexacyanoferrate can be determined photometrically down to <10−9 mol/l. Although this procedure is very sensitive, the analysis can be performed with a simple photometer. Absorbance changes >0.2 can easily be obtained in 1 cm cuvettes, even at extremely small concentrations of hexacyanoferrate, because it is not an absorbance proportional to the concentration of hexacyanoferrate but rather the formation rate of p-semiquinonediimine which enables the quantitative determination of hexacyanoferrate. Springer-Verlag, 1990 Nickel Ulrich Institute of Physical and Theoretical Chemistry, University of Erlangen-Nürnberg, D-8520, Erlangen, Federal Republic of Germany aut Thormann Brigitte Institute of Physical and Theoretical Chemistry, University of Erlangen-Nürnberg, D-8520, Erlangen, Federal Republic of Germany aut Fresenius' Journal of Analytical Chemistry Springer-Verlag 336/4(1990-01-01), 316-319 0937-0633 336:4<316 1990 336 216 https://doi.org/10.1007/BF00331390 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00331390 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Nickel Ulrich Institute of Physical and Theoretical Chemistry, University of Erlangen-Nürnberg, D-8520, Erlangen, Federal Republic of Germany aut NATIONALLICENCE 700 1- Thormann Brigitte Institute of Physical and Theoretical Chemistry, University of Erlangen-Nürnberg, D-8520, Erlangen, Federal Republic of Germany aut NATIONALLICENCE 773 0- Fresenius' Journal of Analytical Chemistry Springer-Verlag 336/4(1990-01-01), 316-319 0937-0633 336:4<316 1990 336 216 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer