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Sorption-Desorption of Lead (II) and Mercury (II) by Model Associations of Soil Colloids

M. Cruz-Guzmána, R. Celisa, M. C. Hermosína, P. Leoneb, M. Nègreb and J. Cornejo*,a

a Instituto de Recursos Naturales y Agrobiología de Sevilla, CSIC, P.O. Box 1052, 41080 Sevilla, Spain
b Dipartimento di Valorizzazione e Protezione delle Risorce Agroforestali, Università degli Studi di Torino, Via Leonardo da Vinci 44, 10095 Grugliasco, Italy



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Fig. 1. Lead (II) and Hg(II) sorption isotherms (pH = 3) on single model sorbents. Symbols are experimental data points whereas lines are the Langmuir-fit sorption isotherms.

 


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Fig. 2. Fourier transform infrared spectra of Humic acid (a); Pb(II)-treated HA (b); and Hg(II)-treated HA (c).

 


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Fig. 3. Lead (II) and Hg(II) sorption isotherms (pH = 3) on binary model sorbents. Symbols are experimental data points whereas lines are the Langmuir-fit sorption isotherms.

 


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Fig. 4. Lead (II) and Hg(II) sorption isotherms (pH = 3) on ternary model sorbents. Symbols are experimental data points whereas lines are the Langmuir-fit sorption isotherms.

 


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Fig. 5. Lead (II) and Hg(II) desorption from model sorbents: (a) Pb(II) from SW-Ferrih-HA0, (b) Pb(II) from SW-Ferrih-HA8, (c) Hg(II) from SW-Ferrih-HA0, and (d) Hg(II) from SW-Ferrih-HA8.

 





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