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首页> 外文期刊>Marine Chemistry >Submarine ground water discharge: Natural radioactivity accumulation in a wetland ecosystem
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Submarine ground water discharge: Natural radioactivity accumulation in a wetland ecosystem

机译：海底地下水排放：湿地生态系统中的自然放射性积累

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摘要

Submarine groundwater discharge (SGD) has attracted the interest from the scientific community over the past decade for its impact on biogeochemical cycles of coastal ecosystems and/or management of water resources. SCD is associated with a flow of natural radionuclides (Ra isotopes and ~(222)Rn), which are often used as SGD tracers that can significantly increase the natural background radiation. Although in many circumstances the discharge is produced directly to the sea and therefore the increase of natural radioactivity levels can generally be considered negligible due to a dilution processes, the discharge into coastal wetlands (marshes, coastal lagoons or ponds), with somewhat restricted exchange with the open sea, may require a detailed study of the distribution of natural radionuclides and their effects on the coastal ecosystem. The Peniscola marsh is a Mediterranean coastal wetland where such studies may be of special interest because it is fed exclusively by groundwater, mainly discharging from a deep aquifer with high natural radioactivity content. In the Peniscola marsh, brackish groundwater discharging through the wetland sediments is enriched in radionuclides to maximum values of 2.8 and 616 kBq m~(-3) of ~(226)Ra and ~(222)Rn, respectively. These high dissolved concentrations result in high levels of ~(222)Rn in air (up to 36 Bq m~(-3)) and ~(210)Pb and ~(210)Po dissolved in water (20 and 5.7 Bq m~(-3), respectively). These elevated levels of natural radionuclides in the Peniscola marsh are also responsible of the significant increase in ~(210)Po and ~(210)Pb contents in both fish and plants.
机译：在过去的十年中，海底地下水排放（SGD）对沿海生态系统的生物地球化学循环和/或水资源管理产生了影响，引起了科学界的关注。 SCD与天然放射性核素（Ra同位素和〜（222）Rn）的流动有关，它们经常用作SGD示踪剂，可以显着增加天然背景辐射。尽管在许多情况下，排放物是直接向海洋排放的，因此由于稀释过程，自然放射性水平的增加通常可以忽略不计，但排放到沿海湿地（沼泽，沿海泻湖或池塘）的排放量受到一定限制在公海中，可能需要详细研究天然放射性核素的分布及其对沿海生态系统的影响。潘尼斯科拉沼泽地是地中海沿岸的湿地，在这些研究中可能特别受关注，因为它仅由地下水喂养，主要是从天然放射性含量高的深层含水层中排放的。在Peniscola沼泽中，通过湿地沉积物排出的微咸地下水富含放射性核素，最大值分别为〜（226）Ra和〜（222）Rn的2.8和616 kBq m〜（-3）。这些高溶解浓度导致空气中〜（222）Rn（高达36 Bq m〜（-3））和〜（210）Pb和〜（210）Po高水平溶解在水中（20和5.7 Bq m〜 （-3））。潘尼斯斯科拉沼泽中天然放射性核素的这些升高水平也造成鱼类和植物中〜（210）Po和〜（210）Pb含量的显着增加。

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  • 来源
    《Marine Chemistry》 |2013年第20期|61-72|共12页
  • 作者

    Jordi Garcia-Orellana; Valenti Rodellas; Nuria Casacuberta; Ester Lopez-Castillo; Marta Vilarrasa; Victoria Moreno; Ester Garcia-Solsona; Pere Masque;

  • 作者单位

    Departament de Fisica, Universitat Autonoma de Barcelona, E-08193 Bellaterra, Spain,Institut de Ciencia i Tecnologia Ambienmls (ICTA), Universitat Autdnoma de Barcelona, E-08193 Bellaterra, Spain;

    Institut de Ciencia i Tecnologia Ambienmls (ICTA), Universitat Autdnoma de Barcelona, E-08193 Bellaterra, Spain;

    Institut de Ciencia i Tecnologia Ambienmls (ICTA), Universitat Autdnoma de Barcelona, E-08193 Bellaterra, Spain;

    Institut de Ciencia i Tecnologia Ambienmls (ICTA), Universitat Autdnoma de Barcelona, E-08193 Bellaterra, Spain;

    Institut de Ciencia i Tecnologia Ambienmls (ICTA), Universitat Autdnoma de Barcelona, E-08193 Bellaterra, Spain;

    Departament de Fisica, Universitat Autonoma de Barcelona, E-08193 Bellaterra, Spain;

    Laboratoire d'Etudes en Geophysique et Ocianographie Spatiales (LECOS/OMP), 14 Av. Edouard Belin, 31400 Toulouse, France;

    Departament de Fisica, Universitat Autonoma de Barcelona, E-08193 Bellaterra, Spain,Institut de Ciencia i Tecnologia Ambienmls (ICTA), Universitat Autdnoma de Barcelona, E-08193 Bellaterra, Spain;

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  • 正文语种 eng
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  • 关键词

    SGD; Natural radioactivity; Plants; Fish; Radionuclides; Ra; Rn; ~(210)Po; ~(210)Pb; ~(226)Ra;

    机译：新币;自然放射性;植物;鱼;放射性核素;Ra;Rn;〜（210）宝;〜（210）Pb;〜（226）镭;

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