J. Environ. Sci. Institute of Environmental Studies and Research – Ain Shams University Vol. 10, No.2, June 2005 ١)ﻤﻨﻴـﺭ ﻋﺒـﺩﻩ ﺍﺒﺭﺍﻫﻴﻡ ﺴﺎﻟﻡ ٢)- ﻤﺤﻤﻭﺩ ﺃﺤﻤﺩ ﺤﻭﻴﺤﻲ ٣)- ﺇﺤﺘﻴﻭﺵ ﻓﺭﺝ ﺇﺤﺘﻴﻭﺵ ٤)ﻋﺒﺩﺍﻟﺤﻤﻴﺩ ﺴﺎﻟﻡ ﺍﻟﺤﺩﺍ- ١) ﻜﻠﻴﺔ ﺍﻟﻌﻠـﻭﻡ، ﺠﺎﻤﻌﺔ ﻋﻴﻥ ﺸﻤﺱ. ٢) ﻤ