GOLD SPECIATION IN NATURAL WATERS: I. SOLUBILITY AND HYDROLYSIS REACTIONS OF GOLD IN AQUEOUS SOLUTION
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dc.contributor.author | Vlassopoulos D. | |
dc.contributor.author | Wood S.A. | |
dc.date.accessioned | 2020-11-02T08:06:09Z | |
dc.date.available | 2020-11-02T08:06:09Z | |
dc.date.issued | 1990 | |
dc.identifier | https://elibrary.ru/item.asp?id=31468182 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 1990, , 1, 3-12 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/18424 | |
dc.description.abstract | Solubility measurements of Au in dilute to concentrated aqueous NaOH solutions at 25°C have been carried out. The data were fitted to the general half reaction Au ( c ) + 2 H 2 O AuO 2 H 4- n 1- n + nH + + e - in order to identify the stoichiometry and stability of the hydrolyzed species formed. The monohydroxide, AuOH(H 2 O) 0 , is found to be the most stable species up to pH ~ 12. The equilibrium constant for the formation of this species (i.e., n = 1) is logK 1 = -22.57 ± 0.44. Consideration of competitive complexation of Au by a number of inorganic ligands which are encountered in natural waters indicates that AuOH(H 2 O) 0 is the most stable inorganic Au species over a wide range of Eh, pH, and ligand activities. The only inorganic ligands which may occur in natural waters at concentrations high enough to stabilize Au(I) include HS - under reducing conditions, S 2 O 3 2- under alkaline oxidizing conditions, Cl - in very acidic, oxidizing brines, and possibly CN - locally, in environments where there is biogenic and/or anthropogenic production of cyanide. Calculated equilibrium pe-pH diagrams for Cl - and S activities typical of both fresh and sea water show that AuOH(H 2 O) 0 is probably the dominant dissolved Au species in these environments, with the exception of anoxic ocean and lake waters. | |
dc.title | GOLD SPECIATION IN NATURAL WATERS: I. SOLUBILITY AND HYDROLYSIS REACTIONS OF GOLD IN AQUEOUS SOLUTION | |
dc.type | Статья |
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