caa a22 4500 465811159 CHVBK 20180323112116.0 cr unu---uuuuu 170327e19901001xx s 000 0 eng 10.1007/BF02124908 doi (NATIONALLICENCE)springer-10.1007/BF02124908 Uranium in coastal sediments of Tokyo Bay and Funka Bay [Elektronische Daten] [Shizuo Tsunogai, Seiya Nagao, Shintaro Watanabe, Yoshiaki Takahashi, Kazunari Suzuki, Masatoshi Yamada, Koh Harada] The sediment cores from Tokyo Bay and Funka Bay were analyzed for U and its isotopic ratio,234U/238U, after dissolving them in 0.1 M HCl, and 30% H2O2 in 0.05 M HCl. A small fraction of U in the anoxic sediments was dissolved in 0.1M HCl and even the added yield tracer,232U, was lost. The isotopic ratio of H2O2 soluble U in the sediments was equal to that of seawater, suggesting that the H2O2 soluble U in the sediments is authigenic. The 6M HCl solution dissolved part of the lithogenic U besides the authigenic U. The depth profiles of U from the two bays resembled each other. The authigenic U comprised more than half of the total U even at the surface and increased with depth down to 70 cm, showing small maxima at about 20 cm. The concentration of refractory U was nearly constant with depth and similar to that of the pelagic sediments. The highest U concentration, 6 µg g−1 which was about 5 times that of the pelagic sediments, was observed in the layer between 70 and 160 cm depth in Tokyo Bay. The annual sedimentation rates of U in the Tokyo Bay sediments were 2.6 tons at the surface and 7.0 tons at the 70-160 cm depth. The increase in U with depth should be due to the deposition of interstitial U either diffusing downward from the surface indicating the trapping of seawater U, or otherwise diffusing upward from the deeper layer indicating the internal cycling of U within the sediments. the Oceanographical Society of Japan, 1990 Tsunogai Shizuo Department of Chemistry, Faculty of Fisheries, Hokkaido University, 041, Hakodate, Japan aut Nagao Seiya Department of Chemistry, Faculty of Fisheries, Hokkaido University, 041, Hakodate, Japan aut Watanabe Shintaro Department of Chemistry, Faculty of Fisheries, Hokkaido University, 041, Hakodate, Japan aut Takahashi Yoshiaki Department of Chemistry, Faculty of Fisheries, Hokkaido University, 041, Hakodate, Japan aut Suzuki Kazunari Department of Chemistry, Faculty of Fisheries, Hokkaido University, 041, Hakodate, Japan aut Yamada Masatoshi Department of Chemistry, Faculty of Fisheries, Hokkaido University, 041, Hakodate, Japan aut Harada Koh Department of Chemistry, Faculty of Fisheries, Hokkaido University, 041, Hakodate, Japan aut Journal of the Oceanographical Society of Japan Kluwer Academic Publishers 46/5(1990-10-01), 211-218 0029-8131 46:5<211 1990 46 10872 https://doi.org/10.1007/BF02124908 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02124908 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Tsunogai Shizuo Department of Chemistry, Faculty of Fisheries, Hokkaido University, 041, Hakodate, Japan aut NATIONALLICENCE 700 1- Nagao Seiya Department of Chemistry, Faculty of Fisheries, Hokkaido University, 041, Hakodate, Japan aut NATIONALLICENCE 700 1- Watanabe Shintaro Department of Chemistry, Faculty of Fisheries, Hokkaido University, 041, Hakodate, Japan aut NATIONALLICENCE 700 1- Takahashi Yoshiaki Department of Chemistry, Faculty of Fisheries, Hokkaido University, 041, Hakodate, Japan aut NATIONALLICENCE 700 1- Suzuki Kazunari Department of Chemistry, Faculty of Fisheries, Hokkaido University, 041, Hakodate, Japan aut NATIONALLICENCE 700 1- Yamada Masatoshi Department of Chemistry, Faculty of Fisheries, Hokkaido University, 041, Hakodate, Japan aut NATIONALLICENCE 700 1- Harada Koh Department of Chemistry, Faculty of Fisheries, Hokkaido University, 041, Hakodate, Japan aut NATIONALLICENCE 773 0- Journal of the Oceanographical Society of Japan Kluwer Academic Publishers 46/5(1990-10-01), 211-218 0029-8131 46:5<211 1990 46 10872 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer