Clay Minerals -- ARIAS et al. 39 (1): 35 Figure 4

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FIG. 4. Variation of ${psi}$ with pH. Kaolin ( ${circ}$ ), kaolin-humic acid complex –CHA = 26.9 mg g^–1 (•), kaolin +5 µM Hg ( ${square}$ ), humic acid complex –CHA = 26.9 mg g^–+ 5 µM Hg ( ${blacksquare}$ ).