water F-0.05.. A strong correlation is observed
for iron levels between the surface water and the
column water F-0.05.. Finally, the sediment
concentrations show a correlation between
chromium and lead, iron and nickel, copper and
zinc, copper and lead, and zinc and lead F-
0.05.. The significant correlation P-0.05.
between iron, copper and zinc in the surface
water, and between copper, zinc and lead in the
sediment, indicate a natural origin andror a
shared contamination source for these metals.
However, the significant correlation of metals in
water with those in the sediment are due to water
samples not being filtered, thus representing a
complex mixing source. The significant correlation
for iron levels, between the water surface
and the water column could be generated by the
iron turnover between water and sediment in the
Alzate Reservoir system Rosas et al., 1989; Bubb
and Lester, 1995; Renoldi et al., 1997..