AN EVALUATION OF THE DISTRIBUTION AND BEHAVIOR OF URANIUM IN URMIA AQUIFER

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SOHRABI N.; KALANTARI N.; AMIRI V.

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Journal: IRAN-WATER RESOURCES RESEARCH Year:2018 | Volume:14 | Issue:3 Page(s): 236-252

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Title

AN EVALUATION OF THE DISTRIBUTION AND BEHAVIOR OF URANIUM IN URMIA AQUIFER

Author(s)

SOHRABI N. | KALANTARI N. | AMIRI V. | Issue Writer Certificate

Keywords

URANIUMQ1

GROUNDWATERQ2

URMIA AQUIFERQ1

SPECIATIONQ1

Abstract

This study examined URMIA AQUIFER in respect with changes in the concentration of URANIUM (U) in three different periods, and the mechanisms of SPECIATION, distribution, and potential sources of URANIUM in the GROUNDWATER resources. The results showed 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 were below the maximum levels in drinking water recommended by WHO, USEPA, and Iranian standard (30 ppb). The spatial distribution of U indicated 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 showed that Uraninite (UO2) is the dominant species in URMIA AQUIFER in all three periods. The inverse geochemical modeling of GROUNDWATER samples clearly demonstrated that all samples were under-saturated in 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 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.

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