|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|6306684||1618817||2016||10 صفحه PDF||سفارش دهید||دانلود رایگان|
- The natural radionuclides and heavy metals in the sea sediments were analyzed.
- The radiological hazard in the sea sediments was reported.
- The total alpha and beta activity concentrations in the sea waters were determined.
- The heavy metal concentrations in some sediments of the Marmara Sea were over the acceptable limits.
In this study, the natural and anthropogenic radioactivity levels in the sediment samples collected from the Marmara Sea in Turkey were determined. The average activity concentrations (range) of 226Ra, 238U, 232Th, 40K and 137Cs were found to be 23.8 (13.8-34.2) BqÂ kgâ1, 18.8 (6.4-25.9) BqÂ kgâ1, 23.02 (6.3-31.1) BqÂ kgâ1, 558.6 (378.8-693.6) BqÂ kgâ1 and 9.14 (4.8-16.3) BqÂ kgâ1, respectively. Our results showed that the average activity concentrations of 226Ra, 238U and 232Th in the sediment samples were within the acceptable limits; whereas the average activity concentration of 40K in the sediment samples was higher than the worldwide average concentration. The average radium equivalent activity, the average absorbed dose rate and the average external hazard index were calculated as 100.01Â BqÂ kgâ1, 48.32Â nGyÂ hâ1 and 0.27, respectively. The average gross alpha and beta activity in the seawater samples were found to be 0.042Â BqÂ Lâ1 and 13.402Â BqÂ Lâ1, respectively. The gross alpha and beta activity concentrations increased with water depth in the same stations. The average heavy metal concentrations (range) in the sediment samples were 114.6 (21.6-201.7) Î¼gÂ gâ1 for Cr, 568.2 (190.8-1625.1) Î¼gÂ gâ1 for Mn, 39.3 (4.9-83.4) Î¼gÂ gâ1 for Cu, 85.5 (11.0-171.8) Î¼gÂ gâ1 for Zn, 32.9 (9.1-73.1) Î¼gÂ gâ1 for Pb and 49.1 (6.8-103.0) Î¼gÂ gâ1 for Ni. S5 station was heavily polluted by Cr, Cu, Ni and Pb. The results showed that heavy metal enrichment in sediments of the Marmara Sea was widespread.
Journal: Chemosphere - Volume 154, July 2016, Pages 266-275