Abstract
Experiments were conducted at 25~ in aqueous solutions with variable concentrations of Au and humic acid (HA) in order to characterize the formation of Au-HA complexes, reduced colloidal Au ~ and the effect of photo-redox activity. The literature concerning the interaction of gold and humic substances at low temperature is not extensive and, in many cases, contradictory. For many years, it has been suggested that Au transport in ore systems is mostly achieved through inorganic complexation, however, low temperature experiments indicate that Au solubility is enhanced in the presence of humic and fulvic acids suggesting the existence metalorganic complexes (Baker, 1978; Vlassopoulos et al. 1990). Other studies suggest that the role of humic substances is to reduce Au(III) species rather than forming gold-organic complexes (Ong and Swanson, 1969; Machesky et al., 1992). None of these studies explored the photo-redox effect on the system Au(III) humic acid, however the photo-redox effect have been considered for other elements in nature (Hoign6,1996).
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