HYDROCHEMISTRY AND VALIDITY OF TIGRIS RIVER WATER IN KUT CITY

Abstract

Ten samples were taken from the Tigris River for five sites before (S.1), during (S.2, S.3 and S.4) and after (S.5) the city of Kut for two seasons. The locations of these samples were geographically determined by GPS, in addition to conducting physical analysis, electrical conductivity, pH and temperature at the site. Chemical analyzers were carried out in the Central Environmental Laboratory in Kut to determine the concentration of cations and anions to determine the validity of the river water for different purposes in the city of Kut. All samples of River water (both for the November, 2017 and February, 2018) do not give any color and odor and low alkalinity and pH value range between (7.23 - 7.55). The Range of TDS value is between (520 - 671) ppm, fresh water (TDS<1000 ppm), and the range of EC value of the River water samples is between (990 to 1086( μs/cm. The (TH) values range between (237 to 345.5) ppm for two seasons, all samples from River water are hard to very hard for two seasons. The results of the analysis of major elements (cations and anions), in the River Water, showed that the predominant ion in the anions are (SO42-) ions and cations is (Ca2+) ion. Comparing the quality of River water with the standards of different uses, shows that water in Tigris River is suitable as drinking, according to IQS (2009). On the basis of Altoviski 1962) classification, the River is good for livestock uses. On the basis of SAR Todd (1980) classification of irrigation water, all the River water samples belong to excellent water class for both periods.