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タイトル: Natural thorium isotopes levels in marine sediments of Coal-Fired Power Plant
著者: Mohamed, Che Abd Rahim
Shafie, Azlina
キーワード: coastal water
sedimentation rate
radioactive
metals
pollution
発行日: 2010年8月20日
出版者: International Coastal Research Center, Atmosphere and Ocean Research Institute, the University of Tokyo
掲載誌情報: Coastal marine science. Vol. 34, No. 1, 2010, pp. 172-180
抄録: Three sediment cores about 50 cm lengths collected from the coastal of Coal-Fired Power Plant at Kapar, Selangor, Malaysia on 25th October 2003 to investigate fluctuation activity of natural thorium isotopes such as thorium-232, thorium-230 and thorium-228 in various depths of sediments core at the effluent area of Kapar Coal electric power station. Then also affect from the coal-fired power station operation in enhancement activities of natural thorium isotopes to the marine environment. The unsupported activity of thorium-228 used to estimate the sediment mixing with extremely high rate value of 12455cm2 yr(-1) at the hot water discharge station. The activity range of thorium-232, thorium-230 and thorium-228 was from 4.38±0.14 to 11.75±0.51 dpm/g, 2.73±0.11 to 9.54±0.43 dpm/g and 3.34±0.19 to 12.38±0.61 dpm/g, respectively. All three isotopes display non-uniform and greatly fluctuated distribution from surface to the deeper layers as revealed by high sediments mixing. The ratio values of thorium-230/thorium-232 and thorium-228/thorium-232 also exhibited as non-uniform profile where the average ratio of thorium-228/thorium-232 was about 0.76 indicating low contain activity of uranium-238 or uranium-234 in the detrital materials and that uranium was tends to diffuse from sediments during the weathering, erosion and sediments transport. Meanwhile, the ratio of thorium-228/thorium-232 less than unity cause by the leach out process of radium-228 from sediment-water interface. The statistical correlation coefficient value obtained from the Pearson method have a positive correlation between thorium-232, thorium-230 and thorium-228 with Al, Fe and Mn, indicating thorium isotopes were attached with the oxides metals. Then the total carbon value also shows a significant negative correlation with thorium-232 and thorium-228 where these isotopes tend to decrease with increasing total carbon content in the sediments.
内容記述: Proceedings of 4th JSPS-VAST Joint Seminar on 'Coastal Marine Science', Hai Phong, Viet Nam, 26-28 October 2009
Ocean Pollution
URI: http://hdl.handle.net/2261/51667
ISSN: 13493000
出現カテゴリ:Coastal Marine Science
Coastal Marine Science

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