الفهرس 
Introduction
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Abstract
Wadi El-Rayan lakes in El-Fayoum Governorate, Egypt were involved in this study and it is a great depression (703 km) situated in the western desert 40 km south west of El-Fayoum Governorate. Since 1973, the depression has been used as a water reservoir for agricultural drainage water exceeding the capacity of Lake Qarun. Nowadays, it holds two main lakes at defferent elevations, connected by swampy channel.
Fourty samples of surface water, Aquatic plant (Ceratophyllum demersum), sediment and fish (Tilapia nilotica and twenty two samples of Claries lazera (catfish) were collected during winter and summer seasons of the period of (2010/2011). All samples were investigated for estimation of lead, cadmium, zinc , iron, copper and manganese in water, plant sediment and Tilapia, Claries Lazera fish species muscles using Solaar atomic absorption spectrometer M6 of forensic medicine and Toxicology department Lab., Faculty of veterinary medicine, Beni-Suef University.
Our results were revealed that:
1- Lead concentrations (ppm) in different samples:
A- Water samples: Lead levels in water samples during winter and summer seasons were 0.178 ± 0.0127** and 0.22±0.0186** ppm respectively.
B- Aquatic plant samples: Lead levels in the plant samples during winter and summer seasons were 3.1 ± 0.695 and 10.17 ± 2.4 ppm respectively.
C- Sediment samples: Lead level was 29±2.1 ppm respectively.
D- Fish samples: Lead levels in fish samples during winter and summer seasons were 0.206 ± 0.019**and 0.34 ±0.021** ppm in Tilapia Nilotica fish samples and 0.45±0.057**and0.337 ± 0.075** ppm in catfish samples during winter and summer seasons respectively.
The estimated weekly intake for lead (kg/adult person 70 kg/week) for the Tilapia nilotica and Claries lazera fish were ranged from 5.15-8.5 kg and 3.9-5.2 kg in Tilapia and catfish respectively.
2- Cadmium concentrations in different samples (ppm):
A- Water samples: Cadmium levels in water samples during winter and summer Seasons were 0.012±0.001** and 0.023±0.001** ppm respectively.
B- Aquatic plant samples: Cadmium levels in the plant samples during winter and summer seasons were 0.081±0.011and 0.228±0.017 ppm respectively.
C- Sediment samples: Cadmium level was 13.41±2.08**ppm respectively.
D- Fish samples: Cadmium levels in fish samples during winter and summer seasons were 0.027±0.001**and 0.034±0.002**ppm in Tilapia Nilotica fish samples and were 0.019±0.002**and 0.056±0.009** ppm in catfish samples during winter and summer seasons respectively.