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Characteristic seasonal variation in dissolved uranium concentration induced by the change of lake water pH in Lake Biwa, Japan

机译：日本琵琶湖的湖水pH值变化引起的溶解铀浓度特征季节性变化

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摘要

Epilimnion-dominated profiles of dissolved uranium (U) have been observed during summer in an oxygenated Japanese lake, Lake Biwa, contrary to the commonly accepted view that U shows conservative behavior in oxygenated seas and lakes. Monthly observations were conducted to reveal the mechanism for such characteristic distribution and geochemical behavior of dissolved U in the lake. In the surface water, dissolved U concentration started to increase in spring, peaked in summer, and decreased from autumn to winter. In contrast, the concentration remained almost constant in the middle layer (40 m depth) and decreased slightly in the bottom layer (70 m depth) throughout the stagnation period. Mass balance calculations of U suggest that the major mechanism for seasonal variations in the surface layer is the supply of U, not via water inflow from the watershed, but by internal chemical reactions within the lake. A laboratory experiment using the lake water and sediment demonstrated that U was desorbed from and adsorbed onto sediment in response to variations in lake water pH. From these results, it is inferred that the seasonal variation in the concentration of dissolved U in the epilimnion results mainly from the desorptive/adsorptive processes of U between sediment/water interface in response to variation in water pH, which is affected by biological activity in the lake.
机译：夏季，在一个含氧的日本琵琶湖中观察到了上层铀占主导地位的溶解铀（U）分布图，这与普遍认为U在含氧海洋和湖泊中表现出保守的行为相反。每月进行的观测揭示了这种特征分布和溶解的铀在湖中的地球化学行为的机理。在地表水中，溶解态铀的浓度在春季开始增加，在夏季达到峰值，然后从秋季到冬季减少。相反，在整个停滞期，中间层（40 m深度）的浓度几乎保持不变，而底层（70 m深度）的浓度则略有下降。铀的质量平衡计算表明，表层季节性变化的主要机制是铀的供应，不是通过流域的水流入而是通过湖泊内部的化学反应。使用湖水和沉积物的实验室实验表明，响应于湖水pH值的变化，U从沉积物中解吸并吸附到沉积物上。从这些结果可以推断，上层水中溶解铀浓度的季节变化主要是由于沉积物/水界面之间U对水pH值的响应而进行的吸附/吸附过程所致，而吸附/吸附过程受水中生物活性的影响。那个湖。

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