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낙동강(洛東江) 중류수계(中流水系)의 수질조사(水質調査) 연구(硏究)$(1978{\sim}80$년(年))
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- 저자 : 노열(Roh Yul) (검색결과 64 건)
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노열(Yul Roh),문희수(Hi Soo Moon),송윤구(Yun Goo Song) 한국광물학회 2002 광물과 암석 (J.Miner.Soc.Korea) Vol.15 No.3
Microbial metal reduction influences the biogeochemical cycles of carbon and metals as well as plays an important role in the bioremediation of metals, radionuclides, and organic contaminants. The use of bacteria to facilitate the production of magnetite nanoparticles and the formation of carbonated minerals may provide new biotechnological processes for material synthesis and carbon sequestration. Metal-reducing bacteria were isolated from a variety of extreme environments, such as deep terrestrial subsurface, deep marine sediments, water near hydrothermal vents, and alkaline ponds. Metal-reducing bacteria isolated from diverse extreme environments were able to reduce Fe(Ⅲ), Mn(Ⅳ), Cr(Ⅵ), Co(Ⅲ), and U(Ⅵ) using short chain fatty acids and/or hydrogen as the electron donors. These bacteria exhibited diverse mineral precipitation capabilities including the formation of magnetite (Fe_3O_4), siderite (FeCO_3), calcite (CaCO_3), rhodochrosite (MnCO_3), vivianite [Fe_3(PO_4)_2·8H_2O], and uraninite (UO_2). Geochemical and environmental factors such as atmospheres, chemical milieu, and species of bacteria affected the extent of Fe(Ⅲ)-reduction as well as the mineralogy and morphology of the crystalline iron mineral phases. Thermophilic bacteria use amorphous Fe(Ⅲ)-oxyhydroxide plus metals (Co, Cr, Ni) as an electron acceptor and organic carbon as an electron donor to synthesize metal-substituted magnetite. Metal reducing bacteria were capable of CO_2 conversion into sparingly soluble carbonate minerals, such as siderite and calcite using amorphous Fe(Ⅲ)-oxyhydroxide or metal-rich fly ash. These results indicate that microbial Fe(Ⅲ)-reduction may not only play important roles in iron and carbon biogecochemistry in natural environments, but also be potentially useful for the synthesis of submicron-sized ferromagnetic materials.
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