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Fulvic acid concentration (mg l 1)

FIGURE 7.6 Transmission electron microscopy of hematite (Fe2O3) colloids in the presence of (A) 0, (B) 0.7, and (C) 4.9 mg l-1 of added Suwannee River standard natural organic matter (pH 7). Bars in the figure correspond to 500 nm. (D) Electrophoretic mobilities of hematite colloids (10 mgl-1) as a function of an increasing concentration of the standard Suwannee River fulvic acid at pH 6.5 and three different ionic strengths: (NaCl: 5 mM, ■; 50 mM, A; 250 mM, O.) (Taken from Wilkinson, K.J., J.C. Negre, and J. Buffle. Journal of Contaminant Hydrology, 1997. 26(1-4): p. 229-43 with permission from Elsevier.)

Fulvic acid concentration (mg l 1)

FIGURE 7.6 Transmission electron microscopy of hematite (Fe2O3) colloids in the presence of (A) 0, (B) 0.7, and (C) 4.9 mg l-1 of added Suwannee River standard natural organic matter (pH 7). Bars in the figure correspond to 500 nm. (D) Electrophoretic mobilities of hematite colloids (10 mgl-1) as a function of an increasing concentration of the standard Suwannee River fulvic acid at pH 6.5 and three different ionic strengths: (NaCl: 5 mM, ■; 50 mM, A; 250 mM, O.) (Taken from Wilkinson, K.J., J.C. Negre, and J. Buffle. Journal of Contaminant Hydrology, 1997. 26(1-4): p. 229-43 with permission from Elsevier.)

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