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Clay Minerals; March 2004; v. 39; no. 1; p. 35-45; DOI: 10.1180/000985543910118
© Mineralogical Society of Great Britain and Ireland

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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 ( ${blacksquare}$ ).

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