تخمین سهم نسبی منابع چندگانه نیترات در آب زیرزمینی دشت ورامین با استفاده از مدل اختلاط ایزوتوپی بیزی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری هیدروژئولوژی گروه زمین شناسی معدنی و آب، دانشکده علوم زمین، دانشگاه شهید بهشتی تهران، ایران

2 استاد، گروه زمین‌شناسی معدنی و آب، دانشکده علوم زمین، دانشگاه شهید بهشتی، تهران، ایران

3 استاد، گروه زمین‌شناسی کاربردی، دانشکده علوم زمین، دانشگاه خوارزمی، کرج، ایران

4 استادیار، گروه زمین‌شناسی معدنی و آب، دانشکده علوم زمین، دانشگاه شهید بهشتی، تهران، ایران

10.22093/wwj.2019.170201.2821

چکیده

آلودگی نیترات آب‌های سطحی و زیرزمینی مشکل مهم کیفیت آب در کره زمین است. در پژوهش‌های متعدد از روش علمی تعیین روابط δ15N-  و δ18O-  برای مشخص نمودن منابع غالب نیترات در آب‌های زیرزمینی، با وجود همپوشانی دامنه‏های ایزوتوپ نیترات و وقوع تفریق ایزوتوپی نیترات، استفاده می‌شود. منابع پتانسیل نیترات در منطقه مورد مطالعه شامل کودهای شیمیایی آمونیوم‌دار، پساب تصفیه‌خانه فاضلاب جنوب تهران، فاضلاب‌های انسانی و حیوانی، رودخانه شور، بارندگی و نیتروژن آلی خاک است. برای شناسایی منابع مختلف نیترات و تخمین سهم نسبی آن‌ها در آب زیرزمینی آبخوان ورامین، از ایزوتوپ‌های دوگانه نیترات (δ15N-  و δ18O- ) و مدل اختلاط ایزوتوپی بیزی برای 38 نمونه در آبان 1396 استفاده شد. بر اساس آنالیز خوشه‌ای سلسله مراتبی، 38 نمونه آب ‌زیرزمینی از لحاظ خصوصیات هیدروشیمیایی به سه خوشه (گروه‌های یک تا سه) تقسیم‌بندی شدند. میانگین مقدار δ15N-  برای گروه‌های 1، 2 و 3 به‌ترتیب 1/2 ±7+، 1/1 ±2/10+ و 1/2 ± 1/16+ و میانگین δ18O- ، به‌ترتیب 9/1 ±3/2+ ، 8/0 ±6/0+، 4/1 ±2/6+ بود. مدل SIAR نشان داد که کودهای آمونیوم‌دار و فاضلاب، بیشترین سهم نیتروژن آلی خاک و بارندگی کمترین سهم را در آلودگی نیترات آبخوان ورامین دارند.

کلیدواژه‌ها


عنوان مقاله [English]

Estimate Proportional Contributions of Multiple Nitrate Sources in Groundwater of Varamin Plain Using a Bayesian Isotope Mixing Model

نویسندگان [English]

  • Zohre Nejatijahromi 1
  • Hamid Reza Nassery 2
  • Mohammad Nakhaei 3
  • Farshad Alijani 4
1 PHD.Student of Hydrogeology, Department of Mining Geology and Water, Faculty of Geology Science, Shahid Beheshti University, Tehran, Iran.
2 Prof., Dept. of Mining Geology and Water, Faculty of Geology Science, Shahid Beheshti University, Tehran, Iran
3 Prof., Dept. of Applied Geology, Faculty of Geology Science, Kharazmi University, Karaj, Iran
4 Assist. Prof., Dept. of Mining Geology and Water, Faculty of Geology Science, Shahid Beheshti University, Tehran, Iran
چکیده [English]

Nitrate (NO3) pollution of surface and ground water is a major problem in water quality on the planet. The scientific method of the relations between δ15N-NO3 and δ18O-NO3 to identified the dominant sources of nitrate in groundwater, despite the overlap of nitrate isotopic ranges and the occurrence of nitrate isotopic fractionation, have been used in numerous studies. NH4+ fertilizer, treated wastewater, sewage and manure, Shour River, NO3 in precipitation and soil organic N, are potential sources of nitrate pollution in the study area. To identify different nitrate sources and to estimate their proportional contribution in the groundwater of the Varamin aquifer, a dual isotope (δ15N-NO3 and δ18O-NO3) method and a Bayesian isotope mixing model for 38 samples in November 2016 have been applied. Based on hierarchical cluster analysis, 38 groundwater samples are classified into three clusters (groups one to three) in terms of hydrochemical properties., the mean values of δ15N–NO3 in groups 1, 2 and 3 are +7.0± 2.1‰, +10.2 ±1.1‰ and +16.1±2.1‰, respectively. The mean of δ18O–NO3 values of the groundwater in groups 1, 2 and 3 are +2.3± 1.9‰, +0.6 ± 0.8‰ and +6.2 ± 1.4‰ , respectively. SIAR model results indicate that the highest contribution in the nitrate pollution of the Varamin aquifer are related to“NH4+ fertilizer” and “manure and sewage” while “soil N” and “NO3 in precipitation” have the lowest influence.

کلیدواژه‌ها [English]

  • NO3− Contamination
  • Stable isotopes
  • Contribution of Pollutants Sources
  • SIAR
  • Varamin Aquifer

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