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127I and 129I species in the English Channel and its adjacent areas: Uncovering impact on the isotopes marine pathways
Water Research ( IF 11.4 ) Pub Date : 2022-09-28 , DOI: 10.1016/j.watres.2022.119178
Peng He 1 , Hongying Pang 2 , Zheng Yang 2 , Sihong Li 2 , Yi Huang 1 , Xiaolin Hou 3 , Göran Possnert 4 , Xuefeng Zheng 5 , Xiangjun Pei 1 , Ala Aldahan 6
Affiliation  

Radioactive iodine-129 has been released from the La Hague nuclear fuel reprocessing facility (NRF) into the English Channel, but the distribution and transformation of the isotope species, and environmental consequences have not been fully characterized in the Channel. Here we present data on iodine isotopes (129I and 127I) species in surface water of the English Channel and the southern Celtic Sea. Compared to 127I species, the concentrations of 129I and 129IO3 show more variations, but iodate is the major species for both 129I and 127I. Our data provide new information regarding iodide-iodate inter-conversion showing that water dilution and mixing are the main factors affecting the 127I and 129I species distribution in the Channel. Some reduction of iodate occurs within the English Channel and mainly in the west part because of biotic processes. The 129I species transformation is overall insignificant, especially in the eastern Channel, where a constant value of 129IO3/129I is observed, which might characterize the La Hague wastewater signal. In the Celtic Sea, oxidation of iodide can be traced by 127I and 129I species. On a larger scale, 129I generally experienced an oxidation process in the Atlantic Ocean, while in the coast of shallow shelf seas, new produced 129I can be identified, especially in the German Bight and the Baltic Sea. The data of 129I species in the English Channel can provide estimate of redox rates in a much broader marine areas if the transit time of 129I from La Hague is well-defined. Furthermore, estimate of inventories for 129I and its species in the Channel, and fluxes of 129I species from the English Channel to the North Sea add important information to the geochemical cycle of 129I.



中文翻译:

英吉利海峡及其邻近地区的 127I 和 129I 物种:揭示对同位素海洋通道的影响

放射性碘 129 已从拉海牙核燃料后处理设施 (NRF) 释放到英吉利海峡,但该海峡的同位素种类的分布和转化以及环境后果尚未得到充分描述。在这里,我们展示了英吉利海峡和凯尔特海南部地表水中碘同位素( 129 I 和127 I)物种的数据。127 I 物种相比, 129 I -129 IO 3 -的浓度变化更大,但碘酸盐是129 I 和127的主要物种一、我们的数据提供了关于碘化物-碘酸盐相互转化的新信息,表明水的稀释和混合是影响海峡中127 I 和129 I 物种分布的主要因素。由于生物过程,英吉利海峡内发生了一些碘酸盐的减少,主要发生在西部。129 I 物种转化总体上不显着,特别是在东部海峡,观察到恒定值129 IO 3 - / 129 I,这可能是拉海牙废水信号的特征。在凯尔特海,碘化物的氧化可以通过127 I 和129 I 物种来追踪。在更大的范围内,129 I 通常在大西洋经历氧化过程,而在浅陆架海沿岸,可以识别出新生产的129 I -,尤其是在德国湾和波罗的海。如果129 I 从拉海牙的运输时间明确,英吉利海峡中129 I 物种的数据可以提供对更广泛海域的氧化还原率的估计。此外,对英吉利海峡中129 I 及其物种的库存估计以及从英吉利海峡到北海的129 I 物种的通量为129 I 的地球化学循环增加了重要信息。

更新日期:2022-09-28
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