Role of Suspended Particulate Matter in Regulating the Behavior of Dissolved Uranium in the Yellow River Estuary

文献类型： 外文期刊

第一作者： Liu, Qian

作者： Liu, Qian;Jiang, Xueyan;Sui, Juanjuan;Xu, Bochao;Meng, Chunxia;Liu, Qian;Jiang, Xueyan;Sui, Juanjuan;Xu, Bochao;Sui, Juanjuan;Guo, Laodong

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关键词： The Yellow River Estuary; Dissolved uranium(U); Suspended particulate matter; Mixing behavior

期刊名称：ESTUARIES AND COASTS （ 影响因子：2.976； 五年影响因子：3.186 ）

ISSN： 1559-2723

年卷期： 2018 年 41 卷 6 期

页码：

收录情况： SCI

摘要： 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. U-234/U-238 activity ratios were somewhat constant showing no measurable isotopic fractionation during physical mixing and U sorption/desorption to/from particles. Addition of dissolved U-238 desorbed/dissolved from SPM during the annual Yellow River water-sediment regulation scheme (Jun 30th-Jul 14th, 2014) was estimated at 6.4 x 10(11) dpm, about 9% of the total riverine flux of dissolved U-238 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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