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Published online 6 January 2006
Published in Soil Sci Soc Am J 70:215-221 (2006)
DOI: 10.2136/sssaj2005.0131
© 2006 Soil Science Society of America
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Heavy Metal Adsorption by Montmorillonites Modified with Natural Organic Cations

M. Cruz-Guzmána, R. Celisa, M. C. Hermosína, W. C. Koskinenb, E. A. Naterb and J. Cornejoa,*

a Instituto de Recursos Naturales y Agrobiología de Sevilla, CSIC, P.O. Box 1052, 41080 Sevilla, Spain
b USDA-ARS, 1991 Upper Buford Circle, Rm. 439, St. Paul, MN 55108



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  		Fig. 1. Chemical structure of L-carnitine, L-cysteine ethyl ester, L-cystine dimethyl ester, thiamine, PTMA, and HDTMA cations.

 


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  		Fig. 2. Pb(II) and Hg(II) adsorption isotherms on selected organoclays.

 


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  		Fig. 3. Hg(II) adsorption isotherms at low (a) and high (b) metal ion concentrations.

 


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  		Fig. 4. Pb(II) desorption from unexchanged and exchanged clays.

 


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  		Fig. 5. Hg(II) desorption from unexchanged and exchanged clays.

 




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