Water samples were obtained from the subsurface layer,at water depth
(60 cm),using poly vinyl chloride Van Dorn plastic bottle(2l)water sampler.
Samples were preserved immediately after collection by acidifying with concentrated nitric acid to pHo2; by using 5 ml conc.HNO3 for 1 l water sample.Water samples were kept in an ice box till analyzed in the laboratory.Water samples were digested using nitric acid digestion method for metals extraction according
to APHA (AmericanPublicHealthAssociation)(1998), and stored cool at4 C
before metal analyses.