F D Gnanam
Articles written in Journal of Chemical Sciences
Volume 91 Issue 1 February 1982 pp 87-99 Physical and Theoretical
The experimental conditions for the periodic precipitation of cobalt(II) oxinate in agar agar gel have been extensively studied. When different cobalt salts are taken over the set gel impregnated with oxine, different parasitic electrolytes are formed along with cobalt(II) oxinate. These parasitic electrolytes affect the solubility and hence the periodic precipitation of cobalt(II) oxirate. The effect of the parasitic electrolytes on the flocculation value has been studied on the basis of Shinohara’s revised flocculation theory. The spacing law of Jablczyr ski and the time law have been experimentally verified.
Volume 93 Issue 5 June 1984 pp 801-811 Physical and Theoretical
The spacing laws of Jablczynski and Mathur are applied to the Liesegang rings of cobalt(II) oxinate, silver iodide and lead chromate in agar gel. Although Jablczynski’s spacing law satisfactorily explains the direct Liesegang rings, it totally fails to describe the revert Liesegang rings. Similary though Mathur’s spacing law is applicable to both revert and direct types of periodic precipitation, an appreciable deviation is observed in systems with greater interspacing. A new spacing law, applicable to both revert and direct Liesegang rings, is proposed on the basis of the preferential adsorption theory of Liesegang rings. It is experimentally verified with silver iodide and lead chromate systems.
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