A STUDY OF CONTAMINATION CRITERIA OF SURFACE WATERS OF AL-NAJAF SEA\SOUTH OF IRAQHAZIM A. WALLI AND WISAM JASIM ABED ALIAbstract The results showed that four months for the area being affected by the prevailing climate in the central region of the country, which is cold in winter and hot and dry in summer. The highest temperatures were recorded in July, while the lowest was in February. The reason for the high pH values in all months, especially July was because of the abundance of water plants and the increase in photosynthesis activity, especially when the temperature rises. The results showed that there were significant differences between the months of the value of dissolved oxygen, as the highest value of dissolved oxygen was in February and the lowest value in July, due to the increase in rain in the winter, the lack of activity of the decomposing organisms, and poor water retention of oxygen at high temperatures. The results showed that there were significant differences in concentrations of ions of mineral elements between months and their absence between stations, where the results showed a rise in concentrations of ions of mineral elements in hot months (July and June), while they decreased in the cold months (February and March) where the highest concentration was in July and the lowest concentration in February, the reason is due to the increase in the activity of the analyzed organisms and the increase in the process of evaporation of water in hot months. The results showed the isolation of seven genera of fungi from the four study stations, where the fungus Alternaria sp was the most common fungi by 33%, followed by Aspergillus flavus by 30%, then the fungus Aspergillus niger by 28%, while the fungus Penicillium citrinum accounted for 17%, while it was Saprolegnia increased by 10%, followed by Trichoderma reesei by 7%, while Pythium sp formed 4%, while Cryptococcus albidus ranked last in isolation rate which was 2%. |