Temperature. Several chemical reactions are temperature
dependant in the way that they proceed at a metal
concentration in plants grown on sewage sludge amended
soil. When the temperature raises the metal activity in the
soil solution as well as that the plant roots may be more
active and has faster absorption rates. Further more, the
absorption rate of the roots may be increased as a result
of higher evapo transpiration from the plant. Yu Ling et al.,
(1998) concluded that considerable enrichment of heavy
metals in the sub micron range occurs during evaporization
of heavy metals in the high temperature environment and
the subsequent condensation in lower temperature regions
of the systems.