الفهرس 
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Abstract
Due to the great importance of seawater quality, the aim of my thesis was to evaluate the degree of pollution by phenolic compounds in suez bay region .The work in my thesis was divided into three chapters Chapter 1: (Introduction) Gives a short account about pollution by phenolic compounds problem, types of phenolic compounds and their hazard to marine environment. Chapter 2: (Results and Discussions) In general the seasonal temperature variations follow those of the prevailing climate conditions. The results indicated that the salinity of the surface water reached its maximum during summer and early autumn and the minimum in winter. This may be attributed to evaporation of water by the elevation of temperature, as well as the entrance of high salinity water from Suez Canal into the bay. However, evaporation is one of the controlling factors for salinity and consequently density, circulation and sea level variation. pH values of both surface and bottom water varied within narrow limit. the oxygen concentration is affected by the temperature pattern being high at low temperatures and the reverse at high temperatures. Definitely, the discharge of wastewater from factories affects the BOD concentration. Such untreated water contains reduced nitrogenous compounds, which reduce the solubility of oxygen and consume part of it. In general, ammonia concentrations of surface water are higher than the bottom water. The results indicate that mean nitrite concentration of the western side near sewage discharge and industrial effluents is higher than that of the English Summary xiii eastern side which is far away from any pollution source. The maximum surface nitrate concentration is 17.64 µm/l at Etaqa Power plant during autumn 2013, this is probably due to sewage discharge and industrial effluents, while the minimum value is 3.27 µm/l at SOPC Marine Jetty during winter 2014, which is far away from any pollution source. On the other hand, nitrate concentration of the bottom water ranges from 12.93 µm/l at Suez Oil Processing Company during autumn 2013 to 2.64 µm/l at Green Island during winter 2014. On seasonal scale, the concentration of dissolved inorganic phosphate was found to increase gradually from its minimum average value during spring 2013 (0.128µm/l) to its maximum (2.72 µm/l) during winter 2014. In all discharged areas, phenol and Chlorophenol was the most dominant fractions. Phenol concentrations ranged from 41.53 at location I to 157.38 ppm at location II. Such concentrations counterparts the existence of phenol in marine environment. On the other hand, Chlorophenol exceeds phenol concentrations which ranged from 212.7 ppm at location I to 763.07 ppm at location II. The appearance of phenol and Chlorophenol at locations I and II is due to the same reasons discussed in previous section. Chapter 3: (Experimental) Include the experimental part of the thesis work and also divided into parts.