Abstract
Adsorption of Pb by soils in the presence of a large amount of Ca was studied. Adsorption was found to conform to the Langmuir and Freundlich isotherms over a large range of concentrations. Organic matter and clay were the dominant constituents contributing towards adsorption maxima for soils. In addition to the parameters derived from two isotherms, the following parameters, initial slope of the isotherms and 1/C at equilibrium for Δ=0.5, were also investigated. The affinity of Pb for sorption sites in soil decreased logarithmically with an increase of surface coverage. Different adsorption mechanisms of Pb in presence and absence of Ca are discussed.
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