Levels of heavy metals in the environment have recently
increased as a consequence ofhuman and industrial
activity. Thus, a study of environmental pollution in a
specific zone, involves the evaluation of heavy metals in
different matrices, such as water, soil, vegetables and sediments:
Among the heavy metals, Pb has been widely studied
because the continuous assimilation of small
quantities of this element causes toxic effects. Lead is released
into the atmosphere from industrial sources (power
plants, manufacturing operations, recycling efforts), peeling
or flaking of Pb-based paint and automobile emissions
from leaded fuels (Baird, 1998). Pb is still detected in dust
and it has been incorporated in the trophic chain even
though lead emissions from cars have recently decreased.