Laboratory of Nuclear Analytical Methods, Institute of Nuclear Chemistry and Technology, Dorodna 16, 03-195 Warsaw, Poland.
Laboratory of Nuclear Analytical Methods, Institute of Nuclear Chemistry and Technology, Dorodna 16, 03-195 Warsaw, Poland.
Talanta. 2018 Jul 1;184:527-536. doi: 10.1016/j.talanta.2018.03.034. Epub 2018 Mar 13.
This work refers to a comparative study of sorbents widely used in determinations of Tc such as TEVA resin and Dowex 1. Despite having a similar functional group of quaternary amines, both materials represent different chromatographic methods-extraction (TEVA resin) and anion exchange (Dowex 1)-which provides a diverse range of their properties significant in determination of Tc in flow conditions. The comparative tests, carried out in a SIA-LOV (Sequential Injection Analysis-Lab-on-Valve) system combined with mass spectrometric (ICP-MS) detection, considered several factors that are crucial from the standpoint of resin´s utility such as sorption capacity, durability, or selectivity, critical in Tc separation from interferences. The developed and optimized analytical procedure based on the application of the TEVA resin provided determinations of Tc at minimum detectable limit (MDL) 6.00 mBq L in 50 min and has been successfully employed in analyses of samples from nuclear industrial and research units (reactor coolant and sewage) as well as from the river surrounding the nuclear reactor. The method proved to be sufficient for routine analysis of water samples in accordance with EPA standards. The reliability of the method was confirmed in the analysis of the BH standard provided by the NPL for inter-laboratory proficiency tests. The Tc recovery for all real samples was evaluated as 80-100%.
这项工作涉及到对 Tc 测定中广泛使用的两种吸附剂（TEVA 树脂和 Dowex 1）的比较研究。尽管它们都具有季铵官能团，但这两种材料代表了不同的色谱方法——萃取（TEVA 树脂）和阴离子交换（Dowex 1）——这为它们在流动条件下测定 Tc 的性质提供了广泛的多样性。在结合了质谱（ICP-MS）检测的 SIA-LOV（顺序注射分析-阀上实验室）系统中进行的比较测试，考虑了从树脂实用性角度来看至关重要的几个因素，如吸附容量、耐用性或选择性，这些因素对于从干扰中分离 Tc 至关重要。基于 TEVA 树脂应用的开发和优化分析程序，在 50 分钟内提供了 Tc 的最低可检测限（MDL）为 6.00 mBq L 的测定结果，并且已成功用于核工业和研究单位（反应堆冷却剂和污水）以及核反应堆周围河流的样品分析。该方法符合 EPA 标准，可用于常规水样分析。该方法在 NPL 提供的 BH 标准的分析中得到了验证，用于进行实验室间能力验证测试。对所有实际样品的 Tc 回收率进行了评估，结果为 80-100%。
