Tungsten (W) is an important metal that has been widely used in industries. It normally occurs as the monomeric tungstate oxyanion in circumneutral to alkaline pH natural waters, but tends to form polytungstate species at low pH and high W concentrations. A number of studies show that W is strongly correlated with dissolved sulfide in natural waters. Here, we present results of thiotungstate and tungstate adsorption to pyrite and goethite. The adsorption data strongly indicates that inner-sphere surface complexation of oxothiotungstate anions may occur as well as W precipitation on the outer-surface of pyrite. Also, the experiments demonstrate the relative adsorption behaviors of thiotungstate and tungstate anions with respect to fresh FeS precipitates, and establish how the degree of sulfidation of W affects W scavenging in sulfidic solutions. Thus, an important product of this research will be surface complexation models for quantifying predications of W-mineral surface reactions in the environment.

Comparison of tungstate and thiotungstate adsorption to iron sulfide and iron oxides minerals under anoxic condition

251st National Meeting (2016)

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