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The importance of complexing in controlling the solubility, transport and precipitation of ore metals in aqueous solutions is a recurrent theme of this book. In this chapter experimental results obtained at the Institute of the Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences, Moscow during the past ten years are reviewed. The results presented here, on the solubility and complexing of a disparate range of metals in aqueous solutions, are linked together by a common methodological approach: the investigation, where possible, of simple systems to determine equilibrium constants for specific complex formation. The scope of this paper is unashamedly idiosyncratic. Some elements have received detailed and extensive study, others only limited investigation. However, the authors attempt to describe the results of many years work to characterize some Fluids in the Crust: Equilibrium and transport properties.

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