The mechanism of adsorption of aurocyanide onto activated carbon, 1. Relation between the effects of oxygen and ionic strength

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Abstract

The poor agreement between different workers regarding the exact mechanism involved in the adsorption of aurocyanide onto activated carbon is shown to be due to differences in the experimental conditions they employed. The effects of oxygen and ionic strength are shown to be interrelated. Adsorption under conditions of high ionic strength, as found in gold plants, involves an ion-pair mechanism whereas, under conditions of low ionic strength, a portion of the gold is adsorbed by electrostatic interacyion with ion-exchange sites formed through oxidation of the carbon surface by molecular oxygen.

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