Preparation et Purification D'Hydrosols de Selenium Stables et Homeodisperses

Abstract

A. WATILLON, F. VAN GRUNDERBEECK et M. HAUTECLER (Bruxelles) SUMMARYHydrophobic selenium colloidal solutions prepared by Kruyt and Van Arkel's method were found to contain a large range of particle size, when verypure water was used. Moreover results were irreproducible. This is probably due to low and irregular nuclei content of the reagents used.By reducing the selenium oxide in presence of gold amicrons very homeodisperse and reproducible sols were obtained.The ionic content of the sols has been determined by a conductometric method. The sols were purified by electrodialysis using an original set up in which the water was continuously purified by ion exchange resins incorporated into the apparatus itself.