摘要
We report the vertical and horizontal distributions of inorganic iodine (iodide and iodate) and their related species (bromide nitrate and nitrite) in the Seto Inland Sea, which is a semi-enclosed coastal sea area of western Japan. In this study, ion chromatography with ultraviolet detection was employed to determine the iodide, iodate, bromide nitrate, and nitrite levels simultaneously in a single run. Iodide was higher at inshore sites than at offshore sites. Vertical profiles showed that iodide increased in the bottom layer of inshore sites of Osaka Bay and Hiroshima Bay, but were low in the bottom layer of the Kii Channel, the main channel connecting Osaka Bay with the Pacific Ocean. Iodates were low in the low-salinity inshore surface, but were high in the bottom layer of the Kii Channel. The riverine flux of iodine to the coastal marine environment was negligible. The vertical profiles of total inorganic iodine (iodide + iodate) looked uniform; however, plots of total inorganic iodine versus salinity demonstrated a net loss of total inorganic iodine in the low-salinity inshore surface. The iodine distributions in the Seto Inland Sea could be explained by three-end-member mixing, with one member being non-iodine river water, another high-salinity and high-iodate water of the open ocean, and the final high-iodide and low-iodate inland water with a salinity of around 32–33. KeywordsIodine Iodide Iodate Ion chromatography Seto Inland Sea
摘要译文
我们报告了濑户内海的无机碘（碘化物和碘酸盐）及其相关物质（硝酸盐和亚硝酸盐）的垂直和水平分布，这是日本西部的一个半封闭的沿海海域。本研究采用紫外检测离子色谱法测定碘化物，碘酸根，硝酸溴，和亚硝酸盐水平同时在一个单一的运行。沿海地区碘离子浓度高于离岸地点。垂直剖面显示，大阪湾，广岛湾近岸底层碘离子含量增加，但Kii通道底层碘含量偏低，连接大阪湾和太平洋的主要通道。碘盐在低盐度的近岸表面低，但在Kii Channel的底层高。碘对沿海海洋环境的河流流量可以忽略不计。总无机碘（碘化物+碘酸盐）的垂直剖面看起来均匀;然而，总无机碘与盐度的关系曲线表明低盐度近岸表面净总无机碘损失。濑户内海的碘分布可以用三端混合来解释，一个成员是非碘河水，另一个是开放海洋的高盐度和高碘酸盐水，以及最终的高碘和低碘酸盐内陆水，盐度约为32-33。碘碘酸根离子色谱濑户内海
Kazuhiko Takeda [1] Kengo Yamane [2] Yuuta Horioka [2] Kazuaki Ito [2 [3]. The Iodide and Iodate Distribution in the Seto Inland Sea, Japan[J]. Aquatic Geochemistry, 2017,23(5-6): 315-330