出版社：The Society of Photographic Science and Technolgy of Japan
摘要：The amount of absorbed gold (III) ion or palladium (II) ion on silver bromide powder was determined by the analysis of the metal ion in solution after some fixed times. Adsorption of palladium (II) ion on silver bromide reached equilibrium immediately after it's addition. On the other hand, the adsorption amount of gold (III) ion increased with the aging time. Addition of thiocyanate increased the adsorption of palladium (II) ion on silver bromide.Isoelectric point of the gelatin was pH 4.9, which was determined by the electrophoresis of the gelatin-silver bromide sol.Electrophoretic mobility of silver bromide sol and that of gelatin-silver bromide sol with palladium (II) and gold (III) ion were measured. It was shown that gold (III) ion could change the sign of the charge of the sol at lower concentration than palladium (II) ion, and palladium ion (II) had the binding affinity with gelatin on the acid side of the isoelectric point (at pH 3.4).Spectrophotometry of palladium thiocyanate-gelatin solution also showed that palladium (II) ion was bound by gelatin.
