Adsorption of CD, CR, NI, AND PB IN saturated soils at maximum adsorption capacity of these heavy metals

Environment pollution and particularly of the soil compartment has been set as a major socio-environmental problem, mainly when it concerns the accumulation of certain chemical elements in the soil. Identifying the adsorption mechanisms, if the process tends to be more specific or electrostatic, or even if the behavior of one metal when other has been previously adsorbed already may contribute to the development of techniques capable to minimize the environmental problems caused by waste rich in heavy metals on the ground previously deposited. Selected soils for this study belong to the predominant classes of the State of Minas Gerais, which have received dosages equivalent to the maximum adsorption capacity (MAC). Soil that are incubated with doses equivalent to MAC of the heavy metals Cd, Cr, Ni, and Pb and that later received larger dosages of those same metals, presented similar behavior when adsorption is analyzed in increasingly different added dosages. There was no correlation between adsorbed values of heavy metals Cd, Cr, Ni, and Pb in soils incubated with the MAC of those metals, with the classes of soils. Heavy metals Cr and Pb were those that adsorbed the largest amounts of heavy metals previously incubated in studied soils, and also those that were adsorbed more strongly in the same situation.