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Concentration, pH, and Surface Charge Effects on Cadmium and Lead Sorption in Three Tropical Soils

Chip Appel* and Lena Ma

Department of Soil and Water Science, Univ. of Florida, Gainesville, FL 32611-0290



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  		Fig. 1. Cadmium and Pb sorption isotherms (I = 0.01 M NaNO3). b is the sorption maximum as determined by the linear form of the Langmuir equation in units of mmol kg-1. Ultisol and Oxisol, R2Pb&Cd = 0.99.

 


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  		Fig. 2. (a) Cadmium and Pb sorption as a function of pH (I = 0.01 M NaNO3). (b) Sorption envelopes of Cd and Pb using a linear model (R2 > 0.91). Points where the {Delta}% sorbed was <=8% when {Delta}pH was approximately 1 were omitted (I = 0.01 M NaNO3; %S = percent sorbed).

 


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  		Fig. 3. Relationship between the amount of sorbed Cd or Pb and the amount of negative surface charge for the (a) Ultisol and (b) Oxisol as a function of pH (I = 0.01 M NaNO3 or NaCl). Complete sorption of added Cd or Pb corresponds to 72 mmolc kg-1.

 


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  		Fig. 4. Relationship between the net negative surface and pH (I = 0.01 M NaCl).

 




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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
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Soil Science Society of America Journal Journal of Plant Registrations The Plant Genome
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