Cadmium recovery by a sulfate-reducing magnetotactic bacterium,Desulfovibrio magneticus RS-1, using magnetic separation |
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Authors: | Arakaki Atsushi Takeyama Haruko Tanaka Tsuyoshi Matsunaga Tadashi |
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Affiliation: | (1) Department of Biotechnology, Tokyo University of Agriculture and Technology, Koganei, 184-8588 Tokyo, Japan |
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Abstract: | Cadmium recovery by a sulfate-reducing magnetotactic bacterium, Desulfovibrio magneticus strain RS-1, was investigated. D. magneticus precipitated >95% of cadmium at an initial concentration of 1.3 ppm in the growth medium. Electron microscopic analysis revealed that D. magneticus formed electron-dense particles on its surface when cultivated in the presence of cadmium ions (Cd2+). Sulfide was also found in the precipitate, and the composition ratio of sulfide/cadmium was 0.7. Sixty percent of viable RS-1 cells was recovered by a simple magnetic separation revealing the removal of 58% cadmium from the culture medium. |
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Keywords: | Desulfovibrio magneticus sulfate-reducing magnetotactic bacterium cadmium, magnetic separation bioremediation |
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