Distribution of dissolved and particulate radiocesium concentrations along rivers and the relations between radiocesium concentration and deposition after the nuclear power plant accident in Fukushima
Distribution of dissolved and particulate radiocesium concentrations along rivers and the relations between radiocesium concentration and deposition after the nuclear power plant accident in Fukushima
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DOI：
10.1016/j.watres.2014.04.024
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发表时间：
2014-09-01
期刊：
影响因子：
12.8
通讯作者：
Komai, Takeshi
中科院分区：
文献类型：
--
作者：
Tsuji, Hideki;Yasutaka, Tetsuo;Komai, Takeshi
本研究涉及测量河水中溶解和颗粒放射性铯（Cs-134 和 Cs-137）的浓度，并确定福岛第一核电站事故后河水中沉积的 Cs-137 量和 Cs-137 浓度之间的定量关系。首先，溶解和颗粒 Cs-134 的当前浓度。在河流流域内对 4 条污染河流（阿武隈河、口猪河、释卡堂河和太田河）的 20 个采样点进行了 Cs-137 测定。不同 Cs-137 形态的分布特征因河流而异。此外，在 Cs-137 沉积更严重的采样位置观察到较高的溶解 Cs-137 浓度。相比之下，沿河颗粒物Cs-137浓度很不规则，因为悬浮物浓度很容易受到扰动和强降水的影响而发生波动。对于每单位重量悬浮固体的 Cs-137 浓度，观察到与溶解的 Cs-137 分布类似的趋势。对四条河流进行了沉积的 Cs-137 和溶解/颗粒 Cs-137 浓度之间的回归分析。结果表明，每条河流沉积的 Cs-137 和溶解的 Cs-137 浓度之间存在很强的相关性，而沉积的 Cs-137 和颗粒物 Cs-137 浓度之间的相关性相对较弱。然而，如果将颗粒 Cs-137 浓度转换为每单位重量悬浮固体的 Cs-137 浓度，则该值显示出与沉积的 Cs-137 具有很强的相关性。 (C) 2014 Elsevier Ltd. 保留所有权利。
This study involved measurement of concentrations of dissolved and particulate radiocesium (Cs-134 and Cs-137) in river water, and determination of the quantitative relations between the amount of deposited Cs-137 and Cs-137 concentrations in river waters after the Fukushima Daiichi nuclear power plant accident. First, the current concentrations of dissolved and particulate Cs-134. Cs-137 were determined in a river watershed from 20 sampling locations in four contaminated rivers (Abukuma, Kuchibuto, Shakado, and Ota).Distribution characteristics of different Cs-137 forms varied with rivers. Moreover, a higher dissolved Cs-137 concentration was observed at the sampling location where the Cs-137 deposition occurred much more heavily. In contrast, particulate Cs-137 concentration along the river was quite irregular, because fluctuations in suspended solids concentrations occur easily from disturbance and heavy precipitation. A similar tendency with dissolved Cs-137 distribution was observed for the Cs-137 concentration per unit weight of suspended solids.Regression analysis between deposited Cs-137 and dissolved/particulate Cs-137 concentrations was performed for the four rivers. The results showed a strong correlation between deposited Cs-137 and dissolved Cs-137, and a relatively weak correlation between deposited Cs-137 and particulate Cs-137 concentration for each river. However, if the particulate Cs-137 concentration was converted to Cs-137 concentration per unit weight of suspended solid, the values showed a strong correlation with deposited Cs-137. (C) 2014 Elsevier Ltd. All rights reserved.