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Simple and sensitive determination of radium-226 in river water by single column-chromatographic separation coupled to SF-ICP-MS analysis in medium resolution mode.
Journal of Environmental Radioactivity ( IF 1.9 ) Pub Date : 2020-05-25 , DOI: 10.1016/j.jenvrad.2020.106305
Guosheng Yang 1 , Jian Zheng 2 , Keiko Tagami 2 , Shigeo Uchida 3 , Jing Zhang 4 , Jinlong Wang 5 , Jinzhou Du 5
Affiliation  

This article describes a novel and simple method to measure ultra-trace 226Ra in river water samples at fg L−1 (mBq L−1) levels as a means for surveying 226Ra in an unintended contamination in river water. To simplify the procedure, a single column was used for separation and purification; 10 mL of AG 50W-X8 resin was packed into a 10 mL Eppendorf pipette tip, which was used as a separation column. A 500 mL sample solution was loaded, and interfering elements were removed with 80 mL 4 M HCl in 20% ethanol. Subsequently, Ra together with Ba was eluted by 20 mL 5 M HNO3 prior to SF-ICP-MS analysis; this allows the naturally existing Ba in water samples to be employed as a yield tracer for 226Ra analysis. Using the medium mode of SF-ICP-MS, the instrumental detection limit of 380 fg L−1 (10 mBq L−1) was obtained. An extremely low method detection limit of 0.46 fg L−1 (0.02 mBq L−1) was achieved with 500-fold pre-concentration. Finally, the developed technique was applied to analyze natural water samples collected from Japanese rivers, in which the 226Ra concentrations varied in the range of 0.7–49.6 fg L−1 (0.03–1.82 mBq L−1).



中文翻译:

单柱色谱分离与中分辨率模式下的SF-ICP-MS分析联用法可简单而灵敏地测定河水中的226镭。

本文介绍了一种新颖,简单的方法来测量fg L -1(mBq L -1)水平的河水样本中的超痕量226 Ra,作为测量河水中意外污染物226 Ra的一种方法。为了简化程序,使用一根色谱柱进行分离和纯化。将10 mL的AG 50W-X8树脂装入10 mL的Eppendorf移液器吸头中,用作分离柱。加载500 mL样品溶液,并用20%乙醇中的80 mL 4 M HCl除去干扰元素。随后,在进行SF-ICP-MS分析之前,用20 mL 5 M HNO 3洗脱Ra和Ba 。这使得水样品中天然存在的Ba可用作226的产量示踪剂Ra分析。使用SF-ICP-MS的中等模式,仪器检测极限为380 fg L -1(10 mBq L -1)。预浓缩500倍,可实现0.46 fg L -1(0.02 mBq L -1)的极低方法检测限。最后,将开发的技术应用于分析从日本河流收集的天然水样,其中226 Ra浓度在0.7–49.6 fg L -1(0.03–1.82 mBq L -1)范围内变化。

更新日期:2020-05-25
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