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首页> 外文期刊>Journal of Environmental Radioactivity >Radionuclides transfer into halophytes growing in tidal salt marshes from the Southwest of Spain
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Radionuclides transfer into halophytes growing in tidal salt marshes from the Southwest of Spain

机译：放射性核素转移到生长在西班牙西南部潮汐盐沼中的盐生植物中

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摘要

Estuaries are sinks of materials and substances which are released directly into them or transported from rivers that drain the basin. It is usual to find high organic matter loads and fine particles in the sediments. We analyzed radionuclide concentrations ((210)po, Th-230, Th-232, U-234, U-238, Ra-226, Th-228, Ra-228, K-40) in sediments and three different organs (roots, stems and leaves) of three species of halophytes plants (Spartina maritima, Spartina densiflora and Sarcocornia perennis). The study was carried out in two tidal salt marshes, one polluted by U-series radionuclides and another nearby that was unpolluted and was used as a control (or reference) area. The Tinto River salt marsh shows high levels of U-series radionuclides coming from mining and industrial discharges. On the contrary, the unperturbed Piedras River salt marsh is located about 25 km from the Tinto marsh, and shows little presence of contaminants and radionuclides. The results of this work have shown that natural radionuclide concentrations (specially the U-isotopes) in the Tinto salt marsh sediments are one order of magnitude higher than those in the Piedras marsh. These radionuclide enhancements are reflected in the different organs of the plants, which have similar concentration increases as the sediments where they have grown. Finally, the transfer factor (IT) of the most polluted radionuclides (U-isotopes and Po-210) in the Tinto area are one order of magnitude higher than in the Piedras area, indicating that the fraction of each radionuclide in the sediment originating from the pollution is more available for the plants than the indigenous fraction. This means that the plants of the salt marshes are unhelpful as bioindicators or for the phytoremediation of radionuclides. (C) 2015 Elsevier Ltd. All rights reserved.
机译：河口是物质和物质的汇，直接释放到河中或从流域的河流中运输。通常会在沉积物中发现高有机物含量和细颗粒。我们分析了沉积物和三个不同器官（根）中的放射性核素浓度（（210）po，Th-230，Th-232，U-234，U-238，Ra-226，Th-228，Ra-228，K-40） ，茎和叶）的三种盐生植物（Spartina maritima，Spartina densiflora和Sarcocornia perennis）。该研究是在两个潮汐盐沼中进行的，其中一个被U系列放射性核素污染，另一个在附近未被污染并被用作对照（或参考）区域。廷托河盐沼显示来自采矿和工业排放的U系列放射性核素水平很高。相反，不受干扰的彼德拉斯河盐沼位于距廷托沼泽约25公里的地方，几乎没有污染物和放射性核素的存在。这项工作的结果表明，廷托盐沼沉积物中的天然放射性核素浓度（特别是U同位素）比彼德拉斯沼泽中的天然放射性核素浓度高一个数量级。这些放射性核素的增强反映在植物的不同器官中，这些器官的浓度随着它们生长的沉积物而增加。最后，廷托地区污染最严重的放射性核素（U同位素和Po-210）的转移因子（IT）比皮德拉斯地区高出一个数量级，表明沉积物中每种放射性核素的比例源自与本地污染相比，植物的污染更多。这意味着盐沼的植物不能作为生物指示剂或放射性核素的植物修复剂。 （C）2015 Elsevier Ltd.保留所有权利。

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