الفهرس 
Detection of some heavy metals in nile-delta water beds and their hygienic significance
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Abstract
This study was conducted to assess the levels of some heavy metals (copper, lead, cadmium and chromium) in water and sediment of Ismailia canal, Elbagoria canal and drainage No. 1, and their accumulated effects in tilapia fish and berseem plant and its implication on both human and animal health. The highest copper values were detected at Ismailia canal where its level reaches 0.32mg / l at 1st site, while the lowest copper values were detected in all sites of Drainage No.1. Low concentrations of Cu were found in muscles while, the highest concentrations were found in liver of tilapia fish. The highest level of Pb was detected at 3rd site of Ismailia canal where it reaches 7.72 and 1.25 æg / g in liver and muscles tissues, respectively. While the Pb was not detected totally in liver tissue in 3rd site of Elbagoria canal and in muscles tissues in 1st site of drainage No.1. It can be also noticed that the highest level of Cd in berseem was (0.65 mg / kg) detected in 2nd site of Elbagoria canal, while Cd level was not detected in all sites of drainage No.1. It is recommended from this study that the areas of heavy pollution along the river Nile should be under control to prevent access to the water with increasing frequency of cleaning of the canals, minimizing the rate of obstruction of the canals; public awareness should be applied to prevent unhygienic practices which impose a major health risk. Avoid fish market from polluted areas