Sorption of Au(Ⅰ, Ⅲ)complexes on Fe, Mn oxides and humic Acid

THE mobilization and transport processes of gold are associated with gold complexes, such as hydroxides,chlorides, hydrogen sulfide, thiosulphate and organic matter. The newest thermodynamic data ofgold hydrolysis show that the gold solubility is controlled by Au(OH)·HO rather than by AuCl~- in mostof the supergene water environment. The deposition process of gold is related to the changes of physicaland chemical properties in the environment, and to sorption. A few studies have been done on thesorption of gold complexes on Fe oxides, metal sulfides, Mn oxide and humic acid, respectively. Butno comparison among their sorption has been made under the same experimental conditions. This study deals with the sortition of Au (Ⅲ) chloride, Au (Ⅰ) chloride and thiosulphate on