sjes-10025

Variations of Major Ionic Composition and Salinity 
of Tigris River within Iraq

Sabah Obaid Hamad Al-Shujairi, Sadeq Oleiwi Sulaiman, Mohamed A. Najemalden

Environmental Department of Central Region, Ministry of Environment – Iraq
Dam and Water Resources Dept. Anbar University, Environmental Department of Northern Region, Ministry of Environment – Iraq


Received : 16/2/2015, Accepted : 3/6/2015

DOI Link: https://doi.org/10.17656/sjes.10025

ABSTRACT
A
Major ions are widely used to identify the hydrochemical and hydrological characteristic of water to assess water quality. Major ions compositions (Ca+2, Mg+2, Na+1, K+1, Cl-1, SO4-2, [HCO3]-1 and [CO3]-2), pH and salinity (TDS) of water in Tigris river were studied to explore the spatial and temporal variations. Six stations (Fishkhapor, Tikrit, Baghdad, Kut, Emarah and Qurna) along river stretch within Iraq were selected to collect samples of water during the period from January 2011 to December 2012 with one month interval. The major ions in Tigris River showed significant spatial variations (p < 0.05), while there is no significant temporal variation. Calcium, sodium and magnesium were the most abundant cations with mean concentrations of 52-95 mg/l, 20-217 mg/l and 22-65 mg/l respectively. Sulfate, bicarbonates and chloride were the most abundant major anions, and its average ranged from 111-432 mg/l, from 151 to 159 mg/l and from 18 to 283 mg/l respectively. Generally, the concentration values of major ions were slightly higher in wet season than those in dry season for the first three stations (Fishkhapor, Tikrit and Baghdad), while the values were far higher for the last three stations (Kut, Emarah and Qurna) due to increasing surface runoff, return irrigation water flow and salinity of soil. Major ions distribution along Tigris River as showed by piper and stiff diagram exhibit different pattern of distributions. The water type changed from calcium- bicarbonate at first two stations (Fishkhapor-Tikrit) into calcium- sulfate at middle two stations (Baghdad-Kut), after that changed into sodium- sulfate at the last two stations (Emarah-Qurna). Changes in water type of the Tigris river indicating the increasing effects of geologic formations downstream direction as well as human activities increasing. Generally, the salinity (TDS) of Tigris water increases downstream where average (TDS) values of the Tigris water at the Turkish Iraqi border (Fishkhapor) is about 300 mg/L and it reaches (as average) more than 1300 mg/L in Basra (Qurna). The variations in salinity exhibit three river sections in terms of salt content (TDS): an upper (northern) section (Fishkhapor-Tikrit), where the initial low salt content is maintained or increased slightly downstream; a middle section (Baghdad-Kut), where the dissolved salt variation is more significant; and a lower (southern) section (Emarah-Qurna), where salt content increased to high levels. The nature of these trends changes is related to the geologic formations that the river passes through, increasing in evaporation rate and increasing human activities.


KEYWORDS: Anions, Cations, Hydrochemical composition, Tigris River, Salinity.

REFERENCES
1. Ahmed, L.M. (1999). Hydrochemistry of Tigris and its change at selected stations through the period 1979-1996, M.Sc. thesis, College of Science,
2. University of Baghhdad.
3. Al-Ansari, N. A. (2013). “Management of water resources in Iraq: perspectives and prognoses.” J. Eng., 5, 667-684.
4. Al-Ansari, N.A. and A. Toma (1984).Bed characteristics of the River Tigris within Baghdad. J. Water Resources, 3(1), 1-23.
5. Al-Ansari, N. and Knutsson, S., (2011). “Toward prudent management of water resources in Iraq.” J. Advanced Science and Eng. Res., 1, 53-67.
6. Ali, Sawsan M., 2014. Assesement of the Spatial Variation of River Tigr(is Chemistry in Iraq by Discriminant Analysis, I JSR Vol. 3, No. 8, p.21- 26.
7. Ali, Sawsan M. and Shaban, Audy H., 2014. Characterizing of some hydrochemical parameters of Tigris River, Iraq, with the aid of GIS. Journal of Natural Sciences Research, 4 (22), p.6-18
8. Al-Marsoumi , Abdul-Mutalib H., Al-Bayati , Kayis M., Al-Mallah, Enas A., 2006. Hydrogeochemical Aspects of Tigris and Euphrates Rivers within Iraq: A Comparative Study, Raf. Jour. Sci., Vol.17, No.2, pp.34- 49.
9. Al-Murib, Muhanned. 2014. Application of CEQUAL-W2 on Tigris River in
10. Iraq. MSc Thesis. Portland State University.
11. APHA, 1999. Standard Methods for Examination of Water and Wastewater. American Public Health Assosiciation, Washington, DC.
12. Asaad, N.M. and Hussan, S.A.A.,1986. Water Quality of Iraq ,I_Tigris River from Tusan – Baghdad, Jour.Wat.Res.,Vol.5,No.2, pp.127-137.
13. Buday, T., 1980. The Regional Geology of Iraq, Vol.1,Stratigraphy and paleogeography, Dar AlKutib pupl.House Mosul,Iraq, 445p.
14. Chen, J., Wang, F., Xia, X., Zhang, L., 2002. Major element chemistry of the Changjiang (Yangtze River). Chemical Geology 187, 231e255.
15. Dhannoun, Hisham Yahya and Mahmood, Hazim Jumaa, 2014. Hydrochemistry of Tigris River Water from its Iraqi‘s Territory Entry to Baghdad city. Iraqi National Journal of Earth Sciences, 14 (1), p. 67-89.
16. Gibbs, R.J., 1970. Mechanisms controlling world water chemistry. Science 170, 1088e1090.
17. Heath, R. C., 1987. Basic Ground-Water Hydrology, Fourth printing, USGS., p.84.
18. Howari, F. M., and Banat, K. M. 2002. Hydrochemical Characteristics of Jordan and Yarmouk River Waters: Effect of Natural and Human Activities. Journal of Hydrology and Hydromechanics, Vol.  50, No.1, pp. 38 - 50.
19. Li, S., Zhang, Q., 2009. Geochemistry of the upper Han River basin, China. 2: seasonal variations in major ion compositions and contribution of precipitation chemistry to the dissolved load. Journal of Hazardous Materials 170, 605e611.
20. Philip, G., 1968. Mineralogy of Recent Sediments of Tigris and Euphrates Rivers and Some of the Older Detritus Deposits, Jour.ed.Pet.Vol.38, No.1, pp.35-44.
21. Rabee, Adel Mashaan, Abdul-Kareem, Bahaa Malik, Al-Dhamin, Ahmed Saad. 2011. Seasonal Variations of Some Ecological Parameters in Tigris River Water at Baghdad Region, Iraq. Journal of Water Resource and Protection, 3, 262-267.
22. Semwal, N., Jangwan, J. S.,2009. Major ion chemistry of river Bhagirathi and river Kosi in the Uttarakh and Himalaya. Int. J. Chem. Sci.: 7(2), 607-616.
23. UNEP/WHO, 1996. Water Quality Monitoring - A Practical Guide to the Design and Implementation of Freshwater Quality Studies and Monitoring Programmes- use and reporting of monitoring data.
24. Van-Bellen, R.C., Dunnington, H.V., Wetzel, R. and Morton, D.M., 1959. Lexique Stratigraphique International, Asie, Vol. 3, Fasc, 10a, Iraq, Paris, 333p.
25. Walton, W. G., 1970. Ground Water, Resource Evaluation, Mc Graw Hill Int. Book Comp. New York, p. 664.


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