Once in soil, some of these metals would be persistent
because of their fairly immobile nature. Other metals however
would be more mobile therefore the potential of transfer
either through soil profile down to ground water aquifer or
via plant - root uptake (bio available) is likely. When the
food chain is concerned, one has to take into account the
mobility and the bio availability of metals, because plant
uptake of metals parallels the bio available fractions of the
metals in soil.