Nuclear Emergency and Environmental Protection Division, Korea Atomic Energy Research Institute (KAERI), 989-111 Daedeok-daero, Yuseong-gu, Daejeon, 34057, Republic of Korea.
Nuclear Emergency and Environmental Protection Division, Korea Atomic Energy Research Institute (KAERI), 989-111 Daedeok-daero, Yuseong-gu, Daejeon, 34057, Republic of Korea; Environmental Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea.
Talanta. 2020 Sep 1;217:121055. doi: 10.1016/j.talanta.2020.121055. Epub 2020 Apr 25.
After the Fukushima Dai-ichi nuclear power plant disaster, the demand for a rapid method for the detection of environmental radioactivity increased drastically. Since the development of extraction chromatography using resins, analytical methods have advanced significantly in terms of simplicity and required labor. Herein, a home-made automated separation system that is applicable radio-extraction chromatographic separation techniques is reported. A simple, rapid, and high-throughput method was developed using this home-made automated separation system to analyze radiostrontium in seawater in emergency and routine situations. For emergency situations, radiostrontium in seawater is pre-concentrated on a cation exchange resin and consecutively purified using the Sr-resin. Fifty minutes are required for the purification of Sr in four samples (100 ml). The minimum detectable activity (MDA) for Sr is 0.2 Bq kg at 100 min counting, with a recovery of 70% and counting efficiency of 95% in the scintillation mode. For routine monitoring, Y that is in equilibrium with Sr is first separated from the sample matrix using DGA. Treatment of 30 L of each seawater sample requires ~2 h. The MDA for this method is 0.3 mBq kg at 400 min counting with a recovery of 70% and counting efficiency of 67% in the Cerenkov mode. By employing the developed method, the measured Sr in seawater collected from the coastal area of Korea is 0.92 ± 0.18 mBq kg, which is comparable to that reported previously. The measurements were obtained using a liquid scintillation counter, and the entire separation process was performed by employing the home-made separation system.
福岛第一核电站灾难后，对快速检测环境放射性的需求急剧增加。自使用树脂开发萃取色谱法以来，分析方法在简单性和所需劳动力方面取得了重大进展。在此，报告了一种适用于放射性萃取色谱分离技术的自制自动化分离系统。使用这种自制的自动化分离系统开发了一种简单、快速和高通量的方法，用于在紧急情况和常规情况下分析海水中的放射性锶。对于紧急情况，海水中的放射性锶在阳离子交换树脂上预浓缩，然后使用 Sr 树脂连续纯化。四个样品（100 ml）的 Sr 纯化需要 50 分钟。在闪烁模式下，Sr 的最小可检测活度（MDA）为 0.2 Bq kg，在 100 分钟计数时回收率为 70%，计数效率为 95%。对于常规监测，首先使用 DGA 从样品基质中分离与 Sr 处于平衡状态的 Y。处理每个 30 L 的海水样品需要约 2 小时。该方法的 MDA 为 0.3 mBq kg，在 400 分钟计数时回收率为 70%，在 Cerenkov 模式下计数效率为 67%。通过采用所开发的方法，从韩国沿海地区采集的海水中测量的 Sr 为 0.92 ± 0.18 mBq kg，与先前报道的结果相当。这些测量是使用液体闪烁计数器获得的，整个分离过程都是通过使用自制的分离系统来完成的。
