بررسي كفيت شيميايي و ميكروبي منابع آب زيرزميني قابل شرب شهر اروميه در سال 1379

STDY OF CHEMICAL AND BACTERIAL QUALITY OF POTABLE GROUND WATER SOURCES IN URMIA IN 2000

Introduction: Ground Water are the most important sources for supplying of potable Water .for cities and villages. from the health point (f view, the Water which is used for drinking, should be pure and has little soluble substances and free from the pathogenic organisms. The aim of this study is to determine the chemical and bacterial quality of ground water Soucrces of URMIA city and comparison with internationol standards. Materials and Methods: The method of study is descriptive and cross - sectional. To determine the chemical and bacterial quality of potable ground water sources, in URMIA city, the number of 74 samples were collected from 37 Deep wells, during Summer season. The bacterial Samples were taken by 250 ml sterlizied glassware and kept in 41 ʹc and then carried them to the laboratory, within less than six hours. Samples were examined in three stages; probabilty, confirmatory and complementary. Chemical sampls were collected in a plastic container (2 litres) and then parameters such as; hardness, alkalinity, electerical conductivity (Ec), Anions and cations of water were examined, and compared with the international standard book (1998). Results: Results obtained from this study indicated that, the mean electerical conductivity (EC). of water wells were less than 1000 micro-pros/cm, and based on shollerʹs diagram for drinking waters, the quality of ground water sources were very good and potable. Among the chemical parameters the concentration of nitrate in two wells was more than standard. The averrage concentration of fluoride was 0.04 ppm and less than standard (0.5 pm?) level. From the bacterial quality point of view, The water wells were .free from bacterial polluliom and no coliform bacteria observed in samples. Discussion: We concluded that there is no problem in the quality of ground water sources. But because of increasing population in future and water demand it is better to examine the chemical and bacterial quality of ground water continousely.