Abstract
The effect of Rhodopseudomonas pallustris bacterium on the sorption of 16 isotopes of lanthanides by quartz and goethite at different pHs values was studied. pH of sorption solution and affinity of elements to surface seems to be most important parameters in the interactions between metal ions and surfaces of biological and mineral sorbents. At acidic (pH°4) and neutral (pH°7) conditions these interactions was affected by electrostatic forces; at alkaline conditions (pH°9) the mechanism of lanthanides precipitation was dominant. Microorganisms sufficiently affected on lanthanides sorption by quartz at acidic and neutral conditions, but largest one was at pH°7. They increased sorption of all elements by goethite at pH°4. There was negligible effect of bacteria on the sorption of lanthanides at pH°7 and 9 by goethite that demonstrates greater affinity of the elements to goethite surface. Microorganisms increased concentration of lanthanides in the nonexchangeable states on the surfaces of quartz at pH°7 and 9, and on the surface of goethite at pH°7 in comparison to the minerals alone. It may be attributed to formation of low-soluble complexes of lanthanides with organic substances, produced by bacterium.
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Acknowledgements
The authors would like to acknowledge the Japan-Russia Youth Exchange Center (Obuchi fellowship) and Russian Foundation for Basic Research (Project 08-05-00419-а) for financial support. We would like to thank Mr. S. Yamazaki (Tokyo Nuclear Co.) for his technical assistance. We also cordially thank Dr. N. Ishii (NIRS) for giving of stock of microorganism, technical assistance and friendly advises.
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Perelomov, L.V., Yoshida, S. Effect of Microorganisms on the Sorption of Lanthanides by Quartz and Goethite at the Different pH Values. Water Air Soil Pollut 194, 217–225 (2008). https://doi.org/10.1007/s11270-008-9711-2
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DOI: https://doi.org/10.1007/s11270-008-9711-2