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.

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。}与^{127 I 物种相比， 129} I ^-和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。