A Review Paper On Determination Of Heavy Metals In Lake Water

Abstract

Heavy metal consist less than one percent of living mass organisms and their different density cause to some disorder, surface waters and also acidic rains can transfer these metal to lake via washing polluted environment. Increased anthropogenic activities have increased the potential pollution of the lake especially the heavy metal pollution which may be toxic to human and aquatic fauna. To determine and compare heavy metal content (Pb, Cd, As and Hg) in edible tissue and gill of grey mullet. The result of heavy metal level is several times lower than arsenic and were found in range 0.01-0.02 g w.w. The concentration of heavy metal in water and their accumulation in the edible tissue of nile Tilapia fish ranged from undectable to 4.57 µg/l for copper (Cu) and also form undectable to 0.25 µg/l ror lead (Pb) but dissolved nickel (Ni) and zinc (Zn) concentration were totally undictable in water sample in lake Hawassa. The order of heavy metal concentration in fish sample were found to decrease in sequence as Zn>Cu>Cr. The levels of the heavy metal concentration were compared with permissible limit value provided by WHO.