الفهرس 
AcknowledgementOnly 14 pages are availabe for public view
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Abstract
The present study was designed to assess the water quality of Damietta branch of the river Nile. It is worth mentioning that the major sources of pollution to Damietta branch are Talkha fertilizers factory, High Serw 1 Drain and High Serw Power station. The study aimed to monitor the level of pollution of the most common pollution parameters in the water and pesticides -miropollutants in water, sediment and fish samples from Damietta branch of the river Nile. Four sampling sites were selected for the present study and based on the major sources of pollution in the branch. These sites extended from Bossat Karim El-Din to Al-Adliah at the north of the Damietta Governorate, namely: Bossat Karim El-Din, Farskour, Al-Kaheel, and Al-Adliah. Physicochemical characteristics for water samples as well as Organochlorine pesticide residues were determined in water, sediment and fish samples. Assessment of the results which was carried out during the study period indicates that BOD concentrations ranged between 1.2 and 8.8 mg/l, with a mean value of 3.43 mg/l for the all study sites and along all seasons. Maximum mean value at Farskour was 4.2 mg/l, and the lowest was recorded in Bossat Karim El-Din (2.6 mg/l). Seasonal variation showed that, the mean values of BOD were 5.17, 2.8, 3.97 and 1.8 mg/l during spring, summer, autumn and winter, respectively. Corresponding values of COD ranged between 16 and 161.6 mg/l, with a mean value of 66.31 mg/l. Site variation showed that the mean values of COD were 57.05, 72.4, 70.73 and 65.05 mg/l at Bossat Karim El-Din, Farskour, Al-Kaheel and Al-Adliah, respectively. Season variation showed that, autumn has the highest concentration while the lowest mean concentration was 20.0 mg/l in summer. In water samples, organochlorine pesticide residues in terms of Heptachlor, Heptachlor epoxide, Endosulfan І, Dieldrin, Endrin, Endrin aldehyde and Methoxychlor, were not detected, while α-BHC concentrations were 66.87, 18.52, 25.28 and 53 µg/l at Bossat Karim El-Din, Farskour, Al-Kaheel and Al-Adliah, respectively. Aldrin concentrations were 10.84, 16.65 and 14.74 µg/l at Farskour, Al-Kaheel and Al-Adliah, respectively. 4,4`-DDE, 4,4`-DDD and Endosulfan ІІ were only detected at Bossat Karim El-Din, with a values of 16, 50.72 and 44.78 µg/l, respectively. At the same time, 4,4`-DDT and Endosulfan sulfate were only detected at Al-Kaheel water samples with concentrations value of 41.83 and 36.35 µg/l, respectively. Only β-BHC and Aldrin pesticide were detected only during atutumn. The concentration of β-BHC was 10.15 µg/l at Al-Kaheel, while Aldrin concentration was 6.49 µg/l at Al-Adliah sampling sites. α-BHC was detected at Al-Kaheel and Al-Adliah, with a value of 15.34 and 16.25 µg/l, respectively. σ-BHC and Aldrin were detected only at Al-Adliah site with, a value 1.16 and 7.06 µg/l, respectively.