This work refers to a comparative study of sorbents widely used in determinations of ⁹⁹Tc 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 ⁹⁹Tc 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 ⁹⁹Tc separation from interferences. The developed and optimized analytical procedure based on the application of the TEVA resin provided determinations of ⁹⁹Tc at minimum detectable limit (MDL) 6.00 mBq L^-1 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 ⁹⁹Tc recovery for all real samples was evaluated as 80-100%.

这项工作是对广泛用于测定⁹⁹ Tc的吸附剂（例如TEVA树脂和Dowex 1）进行的比较研究。尽管它们具有类似的季胺官能团，但两种材料仍代表着不同的色谱方法-萃取（TEVA树脂）和阴离子交换（ Dowex 1）-提供多种性能，对测定流动条件下的⁹⁹ Tc具有重要意义。在SIA-LOV（顺序进样分析-阀上实验室）系统中结合质谱（ICP-MS）检测进行的比较测试，从树脂的实用性角度考虑了几个至关重要的因素，例如：吸附能力，耐用性或选择性，对于⁹⁹至关重要Tc与干扰分离。基于TEVA树脂的应用开发和优化的分析程序可在50分钟内测定最小可检测限（MDL）6.00 mBq L ^-1下的⁹⁹ Tc，并已成功用于核工业和研究单位的样品分析（反应堆冷却剂和污水）以及核反应堆周围的河流。事实证明，该方法足以用于按照EPA标准进行水样品的常规分析。该方法的可靠性在NPL为实验室间能力验证提供的BH标准的分析中得到了证实。所有真实样品的⁹⁹ Tc回收率评估为80-100％。