Abstract
Bacterial strains isolated from hot springs and soil of high level natural radiation areas of Ramsar, a northern coastal city of Iran, have been studied for their 226Ra sorption ability from aqueous solutions. Gamma-spectrometry showed that the uptake values of strains A-C, T-A, A-E and CH-G at a radioactivity level of 4.3±0.2 Bq·mlℒ1 were 202±53, 171±49, 123±11 and 53±6 Bq·gℒ1, respectively. Biosorption was the major mechanism involved in 226Ra uptake and was not affected by 2,4-dinitrophenol (DNP) or incubation at 4°C. There was an inverse relationship between the rapid radium uptake value and biomass weight in the strains A-C and A-E. Strain A-C was identified as Citrobacter freundii and strains T-A, A-E and CH-G belonged to the genera Corynebacterium, Chromobacterium and Chryseobacterium, respectively.
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