عنوان مقاله [English]
Groundwater is one of the most important resources of water supply for various uses in many regions all over the globe including Iran. Different contaminants severely affect these resources and might render groundwater unsuitable for consumption. Groundwater contamination by nitrate is a well known globally growing problem due to the population growth and increase of demand for food supplies. This study was conducted to evaluate the nitrate concentration in water resources of Ardabil aquifer using Geographical Information System. Water samples were collected from 63 wells in Ardabil aquifer during the September 2014 and analyzed for nitrate concentration. The average nitrate concentration from the wells was 39.18 mgl-1. Based on the variography analysis, nitrate concentration showed a good spatial structure which may lead to the high performance of the ordinary kriging (R2=0.508) in predicting the groundwater nitrate spatial pattern. Nitrate concentration was very high at the western parts of the aquifer where the Ardabil city and its agricultural lands is located. These results clearly indicates that the anthropogenic sources from human activities and agricultural development are the main reasons of the nitrate pollution in this part of the aquifer.
10. Olijhoek DW, Hellwing AL, Brask M, Weisbjerg MR, Højberg O, Larsen MK, Dijkstra J, Erlandsen EJ, Lund P. Effect of dietary nitrate level on enteric methane production, hydrogen emission, rumen fermentation, and nutrient digestibility in dairy cows. Journal of Dairy Science. 2016; 99(8):6191-205.
11. Jalali M. Nitrates leaching from agricultural land in Hamadan, western Iran. Agriculture, Ecosystems & Environment. 2005; 110(3):210-8.
12. Lalehzari F, Tabatabaie, SH, Yarali N. Variation of nitrate contamination in Shahrekord aquifer and its mapping using GIS. Iran Water Resource Journal. 2009; 3(4): 9-17 [Persian].
13. Karimzadeh M, Abdeh-Kolahchi A, Farrokhian F, Pourdavoodi M. Evaluation of Nitrate concentration in Kohnak aquifer using geographical information system. Second National Congress on Protection and Planning of the Environment; 2013 [Persian]
14. Osati Kh, Salajegheh A, Arekhi S. Spatial variation of nitrate concentrations in groundwater by Geostatistics (Case Study: Kurdan Plain). Journal of Natural Environment. Iranian Journal of Natural Resources. 2013; 65(4): 461-472 [Persian].
15. Hamzepour S, Hosseini-Mobarra SE. Behmanesh J. Evaluation of groundwater quality evaluation using geographical information system (Nitrate concentration). The 6th National Congress and Exhibitation on Environmental Engineering. 2012 [Persian]
16. Jhariya DC, Shandilya AK, Dewangan R. Nitrate Pollution in the Groundwater around Sagar Town, Madhya Pradesh, India. International Conference on Chemical, Ecology and Environmental Sciences. Bangkok 2012; 151-154.
17. Balogun II, Akoteyon IS, Adeaga O. Evaluating land use effects on groundwater quality in Lagos-Nigeria using water quality index. Journal of Scientific Research. 2012; 4 (2):397.
18. Rajaei F, Esmaili Sari A, Salmanmahiny A, Delavar M, Massah Bavani AR. Non point Source Pollution Modeling and Critical Area Priority for Environmental management of Tajan Watershed. Echohydrology. 2016; 3(3): 455-464 [Persian].
19. de Andrade EM, Palácio HA, Souza IH, de Oliveira Leão RA, Guerreiro MJ. Land use effects in groundwater composition of an alluvial aquifer (Trussu River, Brazil) by multivariate techniques. Environmental Research. 2008; 106 (2):170-7.
20. Rezaei-Moghaddam MH, Rahimpour T, Nakhostinrouhi M. Potential Detection of the Groundwater Resources Using Analytic Network Process in Geographic Information System(Case Study: Basins Leading to Tabriz Plain). Echohydrology; 2016; 3(3): 379-389 [Persian].
21. Federation WE, APH Association. Standard methods for the examination of water and wastewater. American Public Health Association (APHA): Washington, DC, USA. 2005.
22. Hassani-Pak AA. Geostatistics. 5th edition. University of Tehran Press. Tehran; 2013 [Persian]
23. Mohammadi J. Pedometrics Volume 2 : Spatial Statistics. Pelk Press. Tehran; 2006 [Persian]
24. ISIRI. Institute of Standards and Industrial Research of Iran: Drinking water-Physical and chemical specifications. 1053. 5th Revision. Tehran; 2008 [Persian].
25. Babiker IS, Mohamed MA, Terao H, Kato K, Ohta K. Assessment of groundwater contamination by nitrate leaching from intensive vegetable cultivation using geographical information system. Environment International. 2004; 29 (8):1009-17.
26. Cambardella CA, Moorman AT, Novak JM, Parkin TB, Karlen DL, Turco RF. Field-scale variability of soil properties in central Iowa soils. Soil Science Society of America Journal. 1994; 58:1501–1511.
27. Badeenezhad A, Gholami M, Jonidi-Jafari A, Ameri A. Factors Affecting nitrate Concentrations in Shiraz Groundwater Using Geographical Information System. Tolooe Behdasht. 2012; 35(2): 47-56 [Persian].
28. Ostovari Y, Beigi-Harchegani H, Davoodian AR. Spatial variation of nitrate in the Lordegan aquifer. Water and Irrigation Management. 2012; 2(1): 55-67 [Persian].
29. Zazouli M, Barafrashtehpour M, BarafrashtehPour Z, Ghalandari V. Temporal and Spatial Variation of Nitrate and Nitrite Concentration in Drinking Water Resource in Kohgiluyeh County Using Geographic Information System. Journal of Mazandaran University of Medical Sciences. 2014; 23 (109): 258-263 [Persian].