Role of Suspended Particulate Matter in Regulating the Behavior of Dissolved Uranium in the Yellow River Estuary |
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| Authors: | Qian Liu Xueyan Jiang Juanjuan Sui Laodong Guo Bochao Xu Chunxia Meng |
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| Institution: | 1.College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao,China;2.Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education,Ocean University of China,Qingdao,China;3.Yellow Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences,Qingdao,China;4.School of Freshwater Sciences,University of Wisconsin-Milwaukee,Milwaukee,USA |
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| Abstract: | In order to examine the mixing behavior of dissolved uranium (U) in estuaries under different suspended particulate matter (SPM) regimes, three laboratory-based experiments were conducted by mixing seawater with river water containing different concentrations of SPM. Comparing this study with other field and laboratory-based experiments, dissolved U behaved differently depending upon the concentration of SPM. When SPM concentrations are >?0.8 g/L in the Yellow River, desorption/dissolution of U from SPM becomes predominant and dissolved U is enriched relative to the theoretical mixing line. However, when SPM concentrations are <?0.8 g/L, dissolved U behaves conservatively with some extent of removal during estuarine mixing. 234U/238U activity ratios were somewhat constant showing no measurable isotopic fractionation during physical mixing and U sorption/desorption to/from particles. Addition of dissolved 238U desorbed/dissolved from SPM during the annual Yellow River water-sediment regulation scheme (Jun 30th–Jul 14th, 2014) was estimated at 6.4?×?1011 dpm, about 9% of the total riverine flux of dissolved 238U during that same period. This study represents a contribution to studies of dissolved U in muddy rivers and estuaries throughout the world. Results reported here provide not only a perspective to better estimate U flux from rivers to the ocean but also new insights into better understanding its estuarine mixing behavior and controlling factors. |
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