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There are many environmental factors that influence the mobility and bioavailability behavior of some heavy metals in soils. One of these factors is the content and form of calcium carbonate in soils.Experimental work has been carried out applying 1 and 3 mmole (mM)of Pb, Cd and Ni (inchloride forms) on 5 different calcareous soils from RasSedr and Marute stations, Egypt. The adsorption of these elements at interval times from 1 hr to 168 hours was measured. Four kinetic models were applied: Elovich, ModifiedFrendlich, Horels and Diffusion equations.The obtained results indicate that the adsorption process take three stages, a rapid rate from the starting timeto about 2 hours,intermediate stage until about 100 hours and slow or steady rate until the end of reaction (168 hrs). Comparing the adsorption processthrough the five soil samples can be arranged as follows; S5>S3>S4>S2>S1. The retention of heavy metals depends on the amount of active calcium carbonate,clay content and surface area of the soil. The values of adsorbed three heavy metals on the five soil samples can be arranged as; Cd>Pb>Ni.The constants of the four kinetic equations (a, b and r 2 ) were compared for the three concentrations of each metal (Elovich, Modified Frendlich Equation "MFE", Horels and Diffusion). The correlation coefficient between soil criteria and the constants of the applied kinetic models reveals that highly positive correlation between active calcium carbonate, surface area and clay content with a and b constants in Elovich and Diffusion equations.

Adsorption Behavior of Lead, Cadmium and Nickel on some Calcareous Soils