Geochemical and radionuclide profile of Tuzla geothermal field, Turkey
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2008
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Abstract
Tuzla geothermal basin is situated in north-western Turkey on the Biga Peninsula, which is located at the west end of the Northern Anatolian Fault system. Soil and water samples were collected between August 2003 and June 2004 to initiate development of a geochemical profile of surface and subsurface waters in the geothermal basin and radionuclide concentrations in soils. All water samples were found to fall within Turkish Water Quality Class 4, meaning they were remarkably contaminated for any water consumption sector (industrial, human use or agricultural) based on sodium and chloride ions. Such waters could be used only after appropriate water treatment. The water samples are of the chloride type in terms of geochemical evaluation. Preliminary geochemical evidence shows that the N-S flowing part of the Tuzla River acts as a natural barrier within the basin. Heavy metal concentrations in the soil samples show slight elevations, especially those obtained from the east part of the basin where thermal springs are dominant. Geochemical calculations were carried out with PHREEQC® software to determine equilibrium concentration of chemical species and saturation indices, by which it is suggested that chloride is the most important ligand to mobilize the heavy metals in the studied system. In addition, the activity concentration and gamma-absorbed dose rates of the terrestrial naturally occurring radionuclides were determined in the soil using gamma-ray spectrometry. The soil activity ranged from 42.77 to 988.66 Bq kg-1 (averaging 138 Bq kg-1) for 238U, 13.27 to 106.31 Bq kg-1 (averaging 32.42 Bq kg-1) for 232Th, and 99.28 to 935.36 Bq kg-1 (averaging 515.44 Bq kg-1) for 40K. The highest value of 238U was found in the soil samples obtained from an area close to the hot spring. © Springer Science+Business Media B.V. 2007.
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Geology , Radioisotopes , Turkey , Balikesir [Turkey] , Biga Peninsula , Canakkale , Eurasia , Turkey , Tuzla Geothermal Field , Chemicals removal (water treatment) , Computer networks , Concentration (process) , Gamma rays , Geothermal fields , Geothermal springs , Heavy metals , Radioisotopes , Soils , Water quality , Water supply , aluminum , bicarbonate , cadmium , calcium , calcium ion , chloride ion , chromium , copper , heavy metal , iron , lead , magnesium , magnesium ion , manganese , potassium , potassium 40 , potassium ion , radioisotope , sodium , sodium ion , strontium , sulfate , surface water , thorium 232 , uranium 238 , zinc , concentration (composition) , heavy metal , hydrochemistry , hydrothermal system , radionuclide , surface water , thermal spring , water chemistry , water quality , agriculture , article , calculation , computer program , controlled study , dosimetry , fluid intake , gamma spectrometry , geochemistry , geothermal energy , industrialization , natural radioactivity , river basin , soil analysis , soil pollution , thermal spring , Turkey (republic) , water analysis , water contamination , water pollution , water quality , water sampling , water treatment , Elements in soil , Geochemical calculations , Geochemistry , Geothermal water , Soil radioactivity , Water pollution