Fe(III) concentrations occurring in acid mine drainage water oxidized cinnabar (HgS), the most common natural mercury mineral. With Clpresent at environmental levels, significant mercury was released to solution. The rate of oxidation of cinnabar was much higher than the rate of mercury release to solution. Most of the mercury was bound to the remaining cinnabar by an unknown mechanism. An isotopic dilution technique was used to calculate the total mercury, both in solution and bound to the remaining cinnabar, released by oxidation.
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