Original scientific paper

Methorics of the Precipitation Processes. XXI. Flocculation and Stabilization Effect of Quinine Sulphate on Silver Iodide Hydrosol In Statu Nascendi

N . Galešić ; Laboratory of Physical Chemistry, Facuity of Science, University of Zagreb, Croatia, Yugoslavia
B . Težak ; Laboratory of Physical Chemistry, Facuity of Science, University of Zagreb, Croatia, Yugoslavia

Abstract

The action ot quinine sulphate on the precipitation of silver
iodide in aqueous medium is investigated. U s ing the tyndallometric
technique it is found that for quinine sulphate the critical concentrations
of flocculation increase from a pproximately 2 X 10- s to
1.3 X 10-5 N, and the critical concentrations of stabilization from
approximately 4 X 10- 5 to 3 X 10 -4 N, a nd are dependent on both
the increase in the silver iodide concentration (from 1 X 10- 4 to
1 X 10-s M) and the sodium iodide excess (from 1 X 10- 5 to
1 X 10-2 M) . In the region of stabilization, quinine sulphate reverses
the negative sol to a pos itive one. Its action on the positive sols is
also stabilizing. Univalent and divalent quinine exhibit approximately
equal behaviour in their interaction with silver iodide sol.
The results ot the observed phenomena indicate that the adsorption
ability of quinine sulphate is of primary and its ionic-coulombic
action of secondary importance.

Keywords

Hrčak ID:

208211

URI

https://hrcak.srce.hr/208211

Publication date:

15.11.1965.

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