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Yamaguchi N Nakano M Takamatsu R Tanida H 《Journal of environmental radioactivity》2010,101(6):451-9983
The transformation of inorganic iodine (I− and IO3−) incubated in soils with varying amounts of organic matter (Andosols from the surface layer of an upland field and forest, as well as Acrisols from surface and subsurface layers of an upland field) was investigated by using the iodine K-edge X-ray absorption near-edge structure (XANES). After 60 d of reaction, both I− and IO3− were transformed into organoiodine in surface soils containing sufficient amounts of organic matter, whereas IO3− remained unchanged in the subsurface soil of Acrisols with low organic matter contents. Transformation of IO3− into organoiodine was not retarded when the microbial activity in soil was reduced by γ-ray irradiation, suggesting that microbial activity was not essential for the transformation of inorganic iodine into organoiodine. Soil organic matter has the ability to transform inorganic iodine into organoiodine. 相似文献
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Ikuhiro Tanida Asami Sakaue Satoshi Osawa 《Journal of Polymers and the Environment》2014,22(3):329-335
A very safe and environmentally friendly solid-state material for bioremediation was prepared using a combination of Aspergillus oryzae and poly(ε-caprolactone) (PCL), a porous biodegradable polymer. The novel material was capable of decomposing 200 ppm formaldehyde solutions to 0 ppm within 7 days. Degradation ability was prolonged by addition of yeast extract-peptone-dextrose medium into the composite; 200 ppm formaldehyde was decomposed to 0 ppm over eight additional decomposition cycles and 100 days. A unique mechanism is proposed where, during PCL degradation, the solid-state composite provides nutrients to A. oryzae. 相似文献
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Yamaguchi N Nakano M Tanida H Fujiwara H Kihou N 《Journal of environmental radioactivity》2006,86(2):212-226
In order to elucidate the cause for the leaching of iodine in a flooded paddy field, we investigated the transformation of an iodine species affected by the water management of the paddy field. The increased concentration of iodide (I(-)) in soil solution of a flooded paddy field suggested that I(-) was leached from the soil under anaerobic conditions. The post-edge feature of X-ray absorption near-edge structure (XANES) for iodate (IO(3)(-)) spiked to soil totally disappeared after anaerobic incubation of the soils, and I(-) was dissolved in the solution. On the other hand, I(-) in contact with the soil was not likely to be oxidized to IO(3)(-) under aerobic incubation. Iodine was leached out in soil solution as I(-) under anaerobic conditions, whereas part of the iodine species was retained by soil as I(2) or organoiodine both under anaerobic and aerobic conditions. 相似文献
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