GEOC 111 |
| Heavy metals behavior in soils and waters continues to be a major concern when discussing natural environment's quality. Therefore, adsorption experiments for Cd, Cu, Pb and Zn were conducted in five A and B horizons of Brazilian soils. Results of Langmuir isotherms showed that maximum adsorption capacity ranged from 0.57 mmol kg-1 for Cd to 61.35 mmol kg-1 for Pb with large variation among horizons and soils. As mobility and bioavailability of these metals are governed by their partition between solid and solution phases, partition coefficients (Kd) for each soil and element were calculated. Results showed that the values of Kds for each metal ranged from 4.69 L kg-1 for Cd to 4,295.4 L kg-1 for Cu and suggested a sequence of increasing mobility as Zn > Cd > Cu > Pb for most soil samples. Based on the data, heavy metals sorption modeling in tropical soils is discussed. |
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Physical Chemistry of Soil and Aquifer Systems: A Symposium in Honor of Garrison Sposito
8:15 AM-11:55 AM, Wednesday, 13 September 2006 Moscone Center -- Room 256, Oral
Sci-Mix
Division of Geochemistry |