Fig. 6 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 + 48 µM Ni(NO₃)₂, (b) 0.1 M NaNO₃ + 14 µM Pb(NO₃)₂ (open circles represent experimental data and lines represent modeled surface complexes)

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