Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie Sklodowska University, 20-031 Lublin, Poland.
Sensors (Basel). 2023 Feb 24;23(5):2552. doi: 10.3390/s23052552.
For the first time a solid state lead-tin microelectrode (diameter ϕ 25 µm) was utilized for U(VI) ion determination by adsorptive stripping voltammetry. The described sensor is characterized by high durability, reusability and eco-friendly features, as the need for using lead and tin ions for metal film preplating has been eliminated, and consequently, the amount of toxic waste has been limited. The advantages of the developed procedure resulted also from the utilization of a microelectrode as a working electrode, because a restricted amount of metals is needed for its construction. Moreover, field analysis is possible to perform thanks to the fact that measurements can be carried out from unmixed solutions. The analytical procedure was optimized. The proposed procedure is characterized by two orders of magnitude linear dynamic range of U(VI) determination from 1 × 10 to 1 × 10 mol L (120 s of accumulation). The detection limit was calculated to be 3.9 × 10 mol L (accumulation time of 120 s). RSD% calculated from seven subsequent U(VI) determinations at a concentration of 2 × 10 mol L was 3.5%. The correctness of the analytical procedure was confirmed by analyzing a natural certified reference material.
首次利用固态铅锡微电极（直径 ϕ 25 µm）通过吸附溶出伏安法测定 U(VI)离子。所描述的传感器具有高耐用性、可重复使用性和环保特性，因为消除了使用铅和锡离子进行金属膜预镀的需要，从而限制了有毒废物的数量。由于使用微电极作为工作电极，该方法的优势也得到了体现，因为其构建只需要少量的金属。此外，由于可以从不混合的溶液中进行测量，因此可以进行现场分析。优化了分析程序。所提出的方法具有 U(VI)从 1 × 10 到 1 × 10 mol L（120 s 累积）的线性动态范围为两个数量级的特点。检测限计算为 3.9 × 10 mol L（120 s 累积时间）。在浓度为 2 × 10 mol L 的情况下，对 7 次后续 U(VI)测定的 RSD% 计算为 3.5%。通过分析天然认证参考物质来确认分析程序的正确性。
