Distribution and supply mechanisms of high uranium concentration in the rivers of Okinawa Island, Japan

Mochizuki Akihito; Hosoda Ko; Sugiyama Masahito

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Distribution and supply mechanisms of high uranium concentration in the rivers of Okinawa Island, Japan

机译：日本冲绳岛河流中高浓度铀的分布和供应机制

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Uranium concentrations in the rivers of Okinawa Island, Japan were determined in this study. Most rivers in the southwestern area of the island showed high U concentrations, the highest of which was 87 and 11 times the average U levels in Japanese rivers and worldwide, respectively. The U concentration in two rivers exceeded the Japanese guideline for public waters. Thermodynamic calculations revealed that the predominant U species in the rivers was Ca2UO2(CO3)(3)(0) (aq) because of high concentrations of calcium and carbonate ions. However, the U concentrations were not explained by either the congruent dissolution of limestone or the input of seawater and/or sea salt aerosols. Therefore, selective dissolution of U from limestone as well as from other rocks and soils via the formation of calcium-uranyl-carbonate complexes may be a possible mechanism for the high riverine U concentrations.

机译：本研究确定了日本冲绳岛河流中的铀浓度。该岛西南部的大多数河流都显示出较高的U浓度，其中最高的分别是日本河流和全球平均U含量的87倍和11倍。两条河流中的U浓度超过了日本的公共水域指南。热力学计算表明，由于钙和碳酸根离子浓度较高，河流中主要的U物种为Ca2UO2（CO3）（3）（0）（aq）。但是，U浓度不能用石灰石的完全溶解或海水和/或海盐气溶胶的输入来解释。因此，通过形成钙-铀酰-碳酸盐复合物来选择性地将U从石灰石以及其他岩石和土壤中溶解出来，可能是河流中U浓度高的可能机制。

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来源
《Geochemical Journal》 |2015年第6期|共6页
作者
Mochizuki Akihito; Hosoda Ko; Sugiyama Masahito;
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正文语种 eng
中图分类地球化学;
关键词
uranium; river; Okinawa Island; guideline value; supply mechanism;

机译：铀;河;冲绳岛;准则值;供应机制;

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Distribution and supply mechanisms of high uranium concentration in the rivers of Okinawa Island, Japan

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