MohamedM El Bouraie - National Water Research Centre, Central Laboratory for Environmental Quality Monitoring, Cairo, Egypt
Ahmed A. El Barbary - Departrnent ofChernistry, Tanta University, Tanta, Egypt

The concentrations of organochlorine pesticides were determined in surface water and bed sediments from El Rahawy drain in the south-western part of Nile Delta. Results obtained show that the concentration of~DDT compounds in surface water range from 0.008 to 0.239 flg L - 1 and from 0.011 to 3.10 flg kg-1 (dry weight)in bed sediments during wet and dry seasons. Hexachlocyclohexanes (HCHs) have also been widely used inthe region but the current environmental concentrations are slightly higher than those of DDT's, which is due to the less persistence of those compounds. Cyclodienes (Cds) were measured, for example as endosulfan II, in concentrations range from 0.021 to 0.823 flg L - 1 and 0.09 to 1.73 flg kg-1 (dry weight) in surface water andbed sediments, respectively. The investigation of OCPs in the surface water and sediments are still within safety margins compared to Canadian guidelines

Organochlorine pesticides · El Rahawy drain · Water · Sediments · Canadian guidelines