ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Polarographic studies of chromate reduction

Ľ. Treindl and J. Koreň

Department of Physical Chemistry, Faculty of Natural Sciences, Komenský University, Bratislava

Abstract: Polarographic reduction of Chromates in neutral non-buffered medium was studied Experimental results indicate that the mechanism of the electrode process is rather complicated. A part of the results corroborate the assumptions of J. J. Lingane and I. M. Kolthoff that the products of the electroreduction of the chromáte ions — the chromium(III) hydroxide or the basic chromium(III) chromáte — are adsorbed on a surface film and this film hinders the electroreduction. Since the kind and the concentration of the basic electrolyte influence on the first wave of the Chromates, the assumptions of J. J. Lingane and I. M. Kolthoff may be completed in that the minimum is explained as being due to the electrostatic repulsive forces of anions which are being reduced on the negatively charged electrode surface. The above results and their interpretation are related — among others — to the works of L. Gierst and coworkers.

Full paper in Portable Document Format: 221a56.pdf (in Slovak)

Chemical Papers 22 (1) 56–61 (1968)