Abstract
The amount of Hg sorbed by kaolinite and illite, in the absence of ligands, changes little with pH; with montmorillonite, Hg uptake decreases with increasing pH.
An overall decrease in the amounts sorbed by these clays occurs in solutions which contain ligands such as cyanide (2:1); acetate (5:1); and nitrilotriacetate (6:5). [Values in parentheses are mole ratio of ligand: Hg.]
In the presence of chloride (2:1), the order for the uptake of Hg by the three clays is illite > montmorillonite > kaolin.
The addition of thiourea (2:1) results in total precipitation of mercury at pH > 4; in the presence of sulfate or phosphate (> 1:1) Hg is lost from solution by precipitation/sorption at pH 4 but the amount decreases to near zero at pH > 8.
Solution processes (i.e. complex formation, precipitation) appear to have a dominating influence on mercury distribution.
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Farrah, H., Pickering, W.F. The sorption of mercury species by clay minerals. Water Air Soil Pollut 9, 23–31 (1978). https://doi.org/10.1007/BF00185744
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DOI: https://doi.org/10.1007/BF00185744