Fig. 5 Triple layer modeling of Hg(II) (0.6 µM) adsorption by kaolinite (3.3 g L^-1) as a function of pH and solution chemistry: (a) 0.1 M NaNO₃ + 0.01 M Na₂SO₄ and (b) 0.1 M NaNO₃ + 0.01 M Na₃PO₄ (open circles represent experimental data and lines represent modeled surface complexes)

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