The Iodide and Iodate Distribution in the Seto Inland Sea, Japan
The Iodide and Iodate Distribution in the Seto Inland Sea, Japan
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日本濑户内海的碘化物和碘酸盐分布
DOI：
10.1007/s10498-017-9324-8
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发表时间：
2017
影响因子：
1.6
通讯作者：
Kazuaki ITO
中科院分区：
文献类型：
--
作者：
Kazuhiko TAKEDA;Kengo YAMANE;Yuuta HORIOKA;Kazuaki ITO
本文报道了日本西部半封闭的近海--内陆海中无机碘(碘化物和碘酸盐)及其相关物种(溴硝酸盐和亚硝酸盐)的垂直和水平分布。本研究采用离子色谱-紫外检测法同时测定了水中碘、碘酸盐、硝酸溴和亚硝酸盐的含量。近岸站点的碘含量高于近海站点。垂直剖面显示，大阪湾和广岛湾近岸站点的底层碘含量增加，而连接大阪湾和太平洋的主要航道Kii海峡的底层碘含量较低。低盐度近岸表层的碘酸盐含量较低，而Kii海峡底层的碘酸盐含量较高。河流中碘向沿海海洋环境的通量可以忽略不计。总无机碘(碘化物+碘酸盐)的垂直分布看起来是一致的；然而，总无机碘与盐度的关系曲线图显示，低盐度近岸表面总无机碘净损失。Sto内海的碘分布可以用三个端元的混合来解释，一个端元是非碘的河水，另一个是公海的高盐度和高碘酸盐水，最后是盐度约为32-33的高碘和低碘酸盐内陆水。
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.