ردیابی منشأ نیترات آب زیرزمینی آبخوان ورامین با استفاده از ایزوتوپ های نیتروژن و اکسیژن نیترات

نوع مقاله: مقاله پژوهشی

نویسندگان

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

2 استاد / گروه زمین شناسی معدنی و آب، دانشکده علوم زمین، دانشگاه شهید بهشتی تهران

3 استاد/ گروه زمین شناسی کابردی دانشکده علوم زمین دانشگاه خوارزمی تهران

4 استادیار / گروه زمین شناسی معدنی و آب، دانشکده علوم زمین، دانشگاه شهید بهشتی تهران

چکیده

در چند دهه اخیر آلودگی نیترات آب زیرزمینی به یک مسئله زیست محیطی جهانی تبدیل شده است. مطالعات اخیر نشان داده است که ایزوتوپ های نیتروژن و اکسیژن ملکول نیترات را می‌توان برای ردیابی دینامیک نیتروژن شامل شناسایی منشآ نیترات و فرآیندهای تحول نیتروژن به کار برد. در این مطالعه، جهت شناسایی منشأ آلودگی نیترات و فرآیندهای تحول نیتروژن ناشی از فعالیت های انسانی در آبخوان ورامین، نسبت ایزوتوپ های پایدار (δD-H2O و 15N–NO3 ، δ18O–NO3) نمونه های آب های زیرزمینی آبخوان ورامین در جنوب شرق تهران، تعیین شده است. این روش بر اساس این واقعیت است که نیترات منشأ گرفته از منابع مختلف، ترکیبات ایزوتوپی متفاوتی را نشان می دهد. علاوه بر این δ18O–NO3 جهت شناسایی نیترات منشأ اتمسفری و همچنین فرایندهای تحول نیتروژن مفید است. تغییرات غلظت نیترات آب زیرزمینی در منطقه مورد مطالعه از mg/l 4/0 تا mg/l 59/79 با مقدار میانگین mg/l 14/25 بود. ترکیبات ایزوتوپی نیتروژن و اکسیژن نیترات در ترکیب با تجزیه و تحلیل پارامترهای هیدورشیمیایی، حداقل دو منبع عمده آلودگی نیترات در منابع آب زیرزمینی دشت ورامین را نشان می‌دهد. این منابع شامل فاضلاب های انسانی و کودهای حیوانی و نیتروژن آلی خاک است که شایع ترین منبع آلودگی نیترات در دشت ورامین، فاضلاب می‌باشد. عمده ترین فرآیندهای تحول نیتروژن در این دشت نیتریت زدایی (Denitrification) به طور خاص در غرب و جنوب غرب و نیتریت زایی (Nitrification) بیشتر در بخش مرکزی آبخوان می‌باشند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Tracing the Sources of Groundwater Nitrate Contamination Using the Nitrogen and Oxygen Isotopes of Nitrate in Varamin Aquifer

نویسندگان [English]

  • ZOHRE NEJATIJAHROMI 1
  • H.R. Nassery 2
  • M. Nakhaei 3
  • F. Alijani 4
1 PHD.Student of Hydrogeology, Department of Mining Geology and Water, Faculty of Geology Science, Shahid Beheshti University, Tehran
2 Professor of Department of Mining Geology and Water, Faculty of Geology Science, Shahid Beheshti University, Tehran
3 Associated Professor, Faculty of Geosciences, Kharazmi University, Tehran, Iran
4 Assistant Professor of Department of Mining Geology and Water, Faculty of Geology Science, Shahid Beheshti University, Tehran
چکیده [English]

Nitrate contamination of groundwater has been concerned as one of the major environmental problems during last few decades. Recent studies have established that the nitrogen (N) and oxygen (O) isotopes of nitrate (NO3) can be used to trace nitrogen dynamics including identifying nitrate sources and nitrogen transformation processes. Stable isotope ratios (δ15N–NO3, δ18O–NO3 and δD-H2O) of groundwater samples were determined used to identify contamination sources and transformation processes occurring in Varamin aquifer, Southeast Tehran, Iran with intense human activities. The approach is based on the realization that NO3 originating from different sources would be exhibit differing isotopic compositions. In addition, δ18O–NO3 is more useful to identify nitrate from atmospheric sources and nitrogen transformation processes. In case study, nitrate concentration of groundwater were in the range of 0.4 to 79.59 mg/l with mean value of 25.14 mg/l. The nitrogen and oxygen isotopic compositions of nitrate in pore water extracts from groundwater samples indicate at least two potential sources of nitrate in Varamin Aquifer. These sources include animal and human waste as well as soil N that most common sources of nitrate contamination in groundwater are wastewater. Denitrification process occurred in the West and South West of Varamin aquifer, specially.

کلیدواژه‌ها [English]

  • Nitrate contamination
  • Source
  • Nitrate isotopes
  • Wastewater
  • Varamin

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