ABSTRACT
Metals differ from other toxic substances in that they are neither created nor destroyed by humans. Nevertheless, utilization by humans influences the potential for health effects in at least two major ways: first by environmental transport such as anthropogenic contributions to air, water, food and soil; and second, by altering the speciation or biochemical form of the element. Lead, in particular, depending upon the reactant surface, pH, redox potential, and other factors can bind tightly to the soil [1-3] with a retention time of 150 to 5000 years [1, 4].
