Determination of strontium-90 from direct separation of yttrium-90 by solid phase extraction using DGA Resin for seawater monitoring
Determination of strontium-90 from direct separation of yttrium-90 by solid phase extraction using DGA Resin for seawater monitoring
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DOI：
10.1016/j.talanta.2016.01.065
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发表时间：
2016-05-15
期刊：
影响因子：
6.1
通讯作者：
Yamada, Masatoshi
中科院分区：
文献类型：
--
作者：
Tazoe, Hirofumi;Obata, Hajime;Yamada, Masatoshi
监测核相关设施附近水环境中的锶-90对公共安全具有重要意义。在核设施事故中观察到海水中锶-90浓度超过本底水平。然而，测量海水中锶-90的分析程序要求很高。在这里，我们展示了一个简单的和高通量的分析技术，用于测定海水样品中的锶-90使用直接钇-90分离。DGA树脂用于通过检测长期平衡中的钇-90衰变（β发射）来确定锶-90的丰度。DGA树脂可以选择性地收集钇-90并去除天然存在的放射性核素，如K-40、（210）pb、Bi-214、U-238和Th-232以及人为放射性核素，如Ba-140和La-140。通过样品分离程序，钇-90的高化学产率达到95.5 +/-2.3%。IAEA-443认证的海水分析结果（107.7 +/- 3.4 mBq kg（-1））与认证值（110 +/- 5 mBq kg（-1））非常一致。该方法在达到长期平衡后，每天可完成8个样品的分析，这在实际海水监测中是一个相当快的通量。处理3L海水样品，计数20 h，最小可测活度可达1.5mBq kg（-1），可用于海洋环境污染监测。根据2013年9月对福岛第一核电站附近天然海水样本进行的10次独立分析，生殖率为3.4%。(C)2016爱思唯尔B. V.保留所有权利。
It is important for public safety to monitor strontium-90 in aquatic environments in the vicinity of nuclear related facilities. Strontium-90 concentrations in seawater exceeding the background level have been observed in accidents of nuclear facilities. However, the analytical procedure for measuring strontium-90 in seawater is highly demanding. Here we show a simple and high throughput analytical technique for the determination of strontium-90 in seawater samples using a direct yttrium-90 separation. The DGA Resin is used to determine the abundance of strontium-90 by detecting yttrium-90 decay (beta-emission) in secular equilibrium. The DGA Resin can selectively collect yttrium-90 and remove naturally occurring radionuclides such as K-40, (210)pb, Bi-214, U-238, and Th-232 and anthropogenic radionuclides such as Ba-140 and La-140. Through a sample separation procedure, a high chemical yield of yttrium-90 was achieved at 95.5 +/- 2.3%. The result of IAEA-443 certified seawater analysis (107.7 +/- 3.4 mBq kg(-1)) was in good agreement with the certified value (110 +/- 5 mBq kg(-1)). By developed method, we can finish analyzing 8 samples per day after achieving secular equilibrium, which is a reasonably fast throughput in actual seawater monitoring. By processing 3 L of seawater sample and applying a counting time of 20 h, minimum detectable activity can be as low as 1.5 mBq kg(-1), which could be applied to monitoring for the contaminated marine environment. Reproducibility was found to be 3.4% according to 10 independent analyses of natural seawater samples from the vicinity of the Fukushima Daiichi Nuclear Power Plant in September 2013. (C) 2016 Elsevier B.V. All rights reserved.