Dissolution of radioactive, cesium-rich microparticles released from the Fukushima Daiichi Nuclear Power Plant in simulated lung fluid, pure-water, and seawater
Dissolution of radioactive, cesium-rich microparticles released from the Fukushima Daiichi Nuclear Power Plant in simulated lung fluid, pure-water, and seawater
复制标题
DOI：
10.1016/j.chemosphere.2019.05.248
复制
发表时间：
2019-10-01
期刊：
影响因子：
8.8
通讯作者：
Utsunomiya, Satoshi
中科院分区：
文献类型：
--
作者：
Suetake, Mizuki;Nakano, Yuriko;Utsunomiya, Satoshi
为了了解2011年3月福岛第一核电站释放的高放射性富铯微粒（CsMPs）的化学持久性，我们首次对从福岛土壤中分离出来的高放射性富铯微粒（CsMPs）进行了系统的溶解实验（一个样品的Cs-137含量为108 Bq，一个样品的Cs-137含量为57.8 Bq），使用三种不同的溶液：模拟肺液、超纯水和人工海水，在25摄氏度和37摄氏度下持续1-63天。Cs-137在3天内快速释放，然后每种溶液类型都达到稳态溶解。测定了25℃时Cs-137的稳态释放率分别为4.7 × 10(3)、1.3 × 10(3)和1.3 × 10(3) Bq。M (-2)s（-1）分别为模拟肺液、超纯水和人工海水。这表明模拟肺液促进CsMPs的溶解。CsMPs的溶解与硅基玻璃相似，并受表面湿度条件的影响。此外，CsMPs的Cs释放受到硅酸盐基质的限速溶解的限制。根据我们的研究结果，与2 Bq相似的CsMPs可能被吸入并沉积在肺泡区，在bbbb35年后完全溶解。此外，CsMPs可能会在环境中存在几十年；因此，CsMPs是造成环境中放射性碳长期影响的重要因素。(C) 2019 Elsevier Ltd.版权所有。
To understand the chemical durability of highly radioactive cesium-rich microparticles (CsMPs) released from the Fukushima Daiichi Nuclear Power Plant in March 2011, we have, for the first time, performed systematic dissolution experiments with CsMPs isolated from Fukushima soils (one sample with 108 Bq and one sample with 57.8 Bq of Cs-137) using three types of solutions: simulated lung fluid, ultrapure water, and artificial sea water, at 25 and 37 degrees C for 1-63 days. The Cs-137 was released rapidly within three days and then steady-state dissolution was achieved for each solution type. The steady-state Cs-137 release rate at 25 degrees C was determined to be 4.7 x 10(3), 1.3 x 10(3), and 1.3 x 10(3) Bq . m(-2)s(-1) for simulated lung fluid, ultrapure water, and artificial sea water, respectively. This indicates that the simulated lung fluid promotes the dissolution of CsMPs. The dissolution of CsMPs is similar to that of Si-based glass and is affected by the surface moisture conditions. In addition, the Cs release from the CsMPs is constrained by the rate-limiting dissolution of silicate matrix. Based on our results, CsMPs with similar to 2 Bq, which can be potentially inhaled and deposited in the alveolar region, are completely dissolved after >35 years. Further, CsMPs could remain in the environment for several decades; as such, CsMPs are important factors contributing to the long-term impacts of radioactive Cs in the environment. (C) 2019 Elsevier Ltd. All rights reserved.