CONTAMINATION OF THE AGRICULTURAL LAND DUE TO INDUSTRIAL ACTIVITIES SOUTHERN OF GREATER CAIRO

The industrial processes in the investigated area include ferrous and non-ferrous metallurgical work, ceramics, fire bricks, cement industry..etc. Soil, weeds, vegetation and dust samples were collected and analysed for several heavy metals. High levels of Pb, Cd, Ni, Cr, Mn and zinc found in the soil close to a lead, zinc smelter. In the heavy contaminated area concentrations of more than 500 ug/g Pb, 1200 ug/g zinc and 50 ug/g Ni and Cd were recorded in the surface soil at 1500 m from the smelter. The concentrations of the heavy metals in the contaminated area (3-5) km from the smelter) reached more than 200 ug/g Pb and 25 ug/g Ni and Cd and 160 ug/g zinc. Higher levels of these toxic elements were found in the dust on the leaves of the examined vegetations. Furthermore, accumulated concentrations reached more than 100 ug/g Pb and 10 ug/g Cd in leaves of herbs and maize. Soil close to cement industry found enriched with heavy metals but it is much less pronounced.