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Clay Minerals; March 2004; v. 39; no. 1; p. 35-45; DOI: 10.1180/000985543910118
© 2004 Mineralogical Society of Great Britain and Ireland
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Interaction of Hg(II) with kaolin-humic acid complexes

M. ARIAS1,*, M. T. BARRAL2, J. DA SILVA-CARVALHAL3, J. C. MEJUTO3 and D. RUBINOS2

1 Area de Edafoloxía e Química Agrícola, Facultade de Ciencias de Ourense, Universidade de Vigo, 32004 Ourense, 2 Departamento de Edafoloxía e Química Agrícola, Facultade de Farmacia, Universidade de Santiago de Compostela, 15706 Santiago de Compostela, 3 Departamento de Química Física, Facultade de Ciencias de Ourense, Universidade de Vigo, 32004 Ourense, Spain



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  		FIG. 1. Adsorption isotherms of Hg on kaolin and kaolin-humic acid complexes. ({circ}) CHA = 0 mg g–1; ({blacksquare}) CHA = 6.6 mg g–1; ({blacktriangleup}) CHA = 12.2 mg g–1; ({diamondsuit}) CHA = 19.5 mg g–1; (•) CHA = 26.9 mg g–1. Error bars represent standard deviations. The absence of error bars implies that the error is less than the size symbol of the symbol.

 


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  		FIG. 2. Desorption of Hg from kaolin. (a) Desorption to 0.01 M NaNO3 solution. (b) Desorption to 0.01 M NaNO3 plus 0.33 x 10–3 M Cu(NO3)2. ({circ}) Adsorption isotherm of Hg on kaolin; Initial Hg concentration: ({blacksquare}) 2.5 x 10–5 M; ({triangleup}) 5 x 10–6 M; (•) 2.5 x 10–6 M.

 


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  		FIG. 3. Hg inorganic species distribution of Hg as a function of pH using the WHAM computer program (Tipping & Hurley, 1992; Tipping, 1994).

 


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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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