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Estimating benthic fluxes of trace elements to hypoxic coastal waters using Po-210

机译：使用Po-210估算缺氧沿海水域微量元素的底流通量

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The activities of colloidal (10 kDa-0.45 mu m) and truly dissolved (<10 kDa) Po-210 and Pb-210, dissolved inorganic nutrients, and trace elements (Al, V, Co, Ni, Cu, Mo, Mn, and Fe) were measured in the artificial and saline Lake Shihwa, South Korea in July 2011. The boundary between oxic and hypoxic layers, indexed by NH4+ Mn, and dissolved oxygen, was determined by the pycnocline formed at the depth of 2-4 m. The total activities of Po-210 and Pb-210 in Lake Shihwa were in the range of 10.5-20.4 dpm 100 L-1 and 6.4 to 9.8 dpm 100 L-1, respectively. The proportions of the truly dissolved, colloidal, and particulate phases were, respectively, 55 +/- 6%, 29 +/- 5%, and 16 +/- 3% for Po-210, and 48 +/- 6%, 29 +/- 7%, and 23 +/- 4% for Pb-210. The activities of Po-210 were 20-55% higher than those of Pb-210. The benthic flux of Po-210 is determined on the basis of the Po-210 mass balance model in the water column. Since the excess activities of dissolved Po-210 relative to Pb-210 showed a positive correlation with the concentrations of trace elements (except for Al), the benthic fluxes of the trace elements from bottom sediment were successfully calculated using these relationships and the Po-210 fluxes. Our study highlights that Po-210 can be used as a powerful tracer for estimating trace element fluxes from bottom sediment in a hypoxic environment (C) 2014 Elsevier Ltd. All rights reserved.
机译：胶体（10 kDa-0.45μm）和真正溶解（<10 kDa）Po-210和Pb-210的活性，溶解的无机养分和微量元素（Al，V，Co，Ni，Cu，Mo，Mn，和Fe）是在2011年7月在韩国的Shihwa人工湖和盐湖中测量的。氧化层和缺氧层之间的边界由NH4 + Mn和溶解氧来指示，由2-4 m深度形成的比可可林确定。 Shihwa湖中Po-210和Pb-210的总活度分别为10.5-20.4 dpm 100 L-1和6.4至9.8 dpm 100 L-1。对于Po-210，真正溶解的，胶体的和颗粒的相的比例分别为55 +/- 6％，29 +/- 5％和16 +/- 3％，以及48 +/- 6％，对于Pb-210，为29 +/- 7％和23 +/- 4％。 Po-210的活性比Pb-210高20-55％。 Po-210的底栖通量是根据水柱中Po-210的质量平衡模型确定的。由于溶解的Po-210相对于Pb-210的过量活度与微量元素的浓度（Al除外）呈正相关，因此，利用这些关系式和Po-210可以成功地计算出底部沉积物中微量元素的底流通量。 210助焊剂。我们的研究强调，Po-210可以用作功能强大的示踪剂，用于估计低氧环境下底部沉积物中的痕量元素通量（C）2014 ElsevierLtd。保留所有权利。

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