ارزیابی توزیع و رفتار اورانیوم در آبخوان ارومیه

نوع مقاله: مقاله پژوهشی

نویسندگان

1 گروه زمین شناسی، دانشکده زمین شناسی، دانشگاه شهید چمران، اهواز، ایران.

2 1- استاد گروه زمین‌شناسی دانشگاه شهید چمران اهواز

3 دانشگاه یزد . گروه زمین شناسی یزد

چکیده

مطالعه حاضر به بررسی تغییرات غلظت اورانیوم (U) در سه بازه زمانی، مکانیسم‌های گونه‌‌زایی، توزیع مکانی و منابع احتمالی اورانیوم در منابع آب‌ زیرزمینی آبخوان ارومیه پرداخته است. نتایج نشان می‌دهد که مقدار اورانیوم به طور کلی بیشتر از 1 میلی‌گرم بر کیلوگرم در سنگ‌های آذرین و دگرگونی و به طور معمول 2 تا 5 میلی‌گرم بر کیلوگرم در سنگ‌های رسوبی است. غلظت اورانیوم در همه نمونه‌های آب زیرزمینی کمتر از بیشترین مقدار توصیه شده توسط استانداردهای WHO، USEPA و استاندارد ایرانی برای آب آشامیدنی (30 میکروگرم بر لیتر) می‌باشد. توزیع مکانی اورانیوم نشان می‌دهد که بیشینه غلظت اورانیوم در نزدیکی سنگ‌های آذرین یافت می‌شود. بررسی گونه‌زایی اورانیوم در این آبخوان برای سه فصل نمونه‌برداری متوالی نشان می‌دهد که در هر سه بازه زمانی، اورانینیت (UO2) گونه غالب در آبخوان ارومیه می‌باشد. مدلسازی معکوس ژئوشیمیایی نشان می‌دهد که نمونه‌های آب زیرزمینی نسبت به تمامی گونه‌های اورانیوم‌دار در حالت تحت اشباع قرار دارند. بر اساس نتایج، تحرک اورانیوم در آب‌‌‌‌های زیرزمینی توسط عواملی همچون Eh، pH و غلظت یون‌های محلول همراه کنترل می‌شود. به طور کلی، سه مکانیسم اصلی در تحرک و یا رسوبگذاری اورانیوم شامل واجذب اورانیوم جذب شده بر روی کانی‌های آهن (به عنوان مثال هماتیت و گوتیت)، واجذب اورانیوم جذب شده بر روی کانی‌های رسی و انتشار اورانیوم از ساختار شبکه کربنات به دلیل جایگزینی با کلسیم می‌باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

An Evaluation of the Distribution and Behavior of Uranium in Urmia Aquifer

نویسندگان [English]

  • nassim sohrabi 1
  • v. amiri 3
1 Department of Geology,Faculty of geology, Shahid Chamran University, Ahvaz, Iran
3 Department of Geology,Kharazmi University, Tehran
چکیده [English]

This study examines changes in the concentration of uranium (U) in three different periods, the mechanisms of speciation, distribution, and potential sources of uranium in the groundwater resources of Urmia aquifer. The results show that the U content is generally more than 1 mg/kg in igneous and metamorphic rocks and typically 2–5 mg/kg in sedimentary rocks. Uranium concentration in all groundwater samples are below the maximum levels in drinking water recommended by WHO, USEPA and Iranian standard (30 ppb). The spatial distribution of U indicates that the maximum concentrations of U can be found in the vicinity of igneous rocks. Investigation of Uranium speciation in this aquifer for three consecutive sampling periods shows that uraninite (UO2) is the dominant species in Urmia aquifer in all three periods. The inverse geochemical modeling of groundwater samples demonstrates clearly that all samples are under-saturated respect with all uranium species. Based on the results, the mobility of uranium in groundwater is controlled by some factors such as Eh, pH, and concentrations of coexisting dissolved ions. In general, the three main mechanisms for controlling the mobility or deposition of uranium include the desorption of uranium absorbed onto ferric minerals (e.g. hematite and goethite), desorption of uranium adsorbed onto clay minerals and the release of uranium from the carbonate lattice structure due to replacement with calcium.

کلیدواژه‌ها [English]

  • Uranium
  • Groundwater
  • Urmia Aquifer
  • Speciation

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