Original scientific paper

Electrokinetic Studies in Dispersed Systems. IV. The Influence of Surface Active Agents on the Electrokinetic Potential of Agl Precipitates

V. Pravdić ; Institute »Ruder Bosković« and Laboratory of Physical Chemistry, Faculty of Science, University of Zagr eb, Zagreb, Croatia, Yugoslavia
M. Mirnik ; Institute »Ruder Bosković« and Laboratory of Physical Chemistry, Faculty of Science, University of Zagr eb, Zagreb, Croatia, Yugoslavia

Abstract

The influenoe of ionic surface active agents (SAA), represented by some aliphatic straight chain amines and acids, on the zeta-potential of Ag! precipitates has been studied. It has been shown that SAA ions are zeta-potential determining in a narrow concentration region only'. This region is independent of the pl of the solution. In case the sign of charge of the SAA ion is the same as that of the original precipitate there is no marked influence on the zetapotential. Whether the sign of the zeta-potential is determined by the activity of the constituent ions in the solution or by the concentration of SAA ions, the magnitude of the zeta-potential is determined by the sign of charge and concentration of the counter ion only. The total potential difference and the zeta-potential are brought about by two differe nt, independent processes.

Keywords

Hrčak ID:

208616

URI

https://hrcak.srce.hr/208616

Publication date:

9.4.1960.

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