Radiocesium distribution and mid-term dynamics in the ponds of the Fukushima Dai-ichi nuclear power plant exclusion zone in 2015-2019
Radiocesium distribution and mid-term dynamics in the ponds of the Fukushima Dai-ichi nuclear power plant exclusion zone in 2015-2019
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DOI：
10.1016/j.chemosphere.2020.129058
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发表时间：
2021-02-01
期刊：
影响因子：
8.8
通讯作者：
Nanba, Kenji
中科院分区：
文献类型：
--
作者：
Konoplev, Alexei;Wakiyama, Yoshifumi;Nanba, Kenji
本研究分析了2015年至2019年福岛第一核电站（FDNPP）禁区内大沼町池塘中的Cs-137行为。颗粒和溶解的Cs-137活性浓度的下降被揭示。发现颗粒Cs-137活性浓度的下降速率常数高于溶解Cs-137活性浓度。在季节性方面，溶解的Cs-137浓度较高，从6月至10月，根据具体的池塘和一年，最有可能是由于温度依赖的Cs-137解吸磨损边缘网站的云母粘土矿物。表观Kd（Cs-137）的研究池塘，在绝对值，似乎是远远高于封闭和半封闭的切尔诺贝利污染区的湖泊，但是，这些是比较的特点的河流和水库的FDNPP污染区的值。悬浮物-水体系的表观Kd（Cs-137）随时间的推移而减小。据推测，这种趋势与玻璃状热颗粒的分解有关。根据选择性吸附和固定理论，利用表层-底层沉积物中Cs-137的形态及其在沉积物-水系统中的分布数据，估算了交换性放射性铯的拦截潜力RIPex（K）。对于所研究的池塘，RIPex（K）平均为2050 mEq/kg，这在文献中报告的实验室研究中测量的值范围内。(C)2020作者（S）爱思唯尔有限公司出版
This study analyzes the Cs-137 behavior in the ponds of Okuma Town from 2015 to 2019 in the Fukushima Dai-ichi nuclear power plant (FDNPP) exclusion zone. A decline in both particulate and dissolved Cs-137 activity concentrations was revealed. The decline rate constants for the particulate Cs-137 activity concentration were found to be higher than for the dissolved Cs-137 activity concentration. In terms of seasonality the dissolved Cs-137 concentrations were higher from June to October, depending on the specific pond and year, most likely due to temperature dependence of Cs-137 desorption from frayed edge sites of micaceous clay minerals. The apparent K-d(Cs-137) in the studied ponds, in absolute value, appeared to be much higher than that for closed and semi-closed lakes of the Chernobyl contaminated area; however, these were comparable to the values characteristic of the rivers and reservoirs of the FDNPP contaminated area. The apparent K-d(Cs-137) in the suspended sediment-water system was observed to decrease over time. It was hypothesized that this trend was associated with the decomposition of glassy hot particles. Relying on the theory of selective sorption and fixation, the exchangeable radiocesium interception potential, RIPex(K) was estimated using data on Cs-137 speciation in the surface bottom-sediment layer and its distribution in the sediment-water system. For the studied ponds, RIPex(K) was on the average 2050 mEq/kg, which is within the range of values measured in laboratory studies reported in the literature. (C) 2020 The Author(s). Published by Elsevier Ltd.