Department of Analytical Chemistry, Faculty of Chemistry and Technology, University of Split, R. Boškovića 35, 21000 Split, Croatia.
Department of Chemistry, Faculty of Science, University of Split, R. Boškovića 33, 21000 Split, Croatia.
Sensors (Basel). 2021 Feb 25;21(5):1612. doi: 10.3390/s21051612.
A novel ion-selective electrode with membranes based on iron(III) phosphate and silver sulfide integrated into a completely new electrode body design has been developed for the determination of iron(III) cations. The best response characteristics with linear potential change were found in the iron(III) concentration range from 3.97 × 10 to 10 mol L. The detection limit was found to be 2.41 × 10 mol L with a slope of -20.53 ± 0.63 and regression coefficient of 0.9925, while the quantification limit was 3.97 × 10 M. The potential change per concentration decade ranged from -13.59 ± 0.54 to -20.53 ± 1.56 for Electrode Body 1 (EB1) and from -17.28 ± 1.04 to -24 ± 1.87 for Electrode Body 2 (EB2), which is presented for the first time in this work. The prepared electrode has a long lifetime and the ability to detect changes in the concentration of iron cations within 20 s. Membrane M1 showed high recoveries in the determination of iron cations in iron(III) standard solutions (98.2-101.2%) as well as in two different pharmaceuticals (98.6-106.5%). This proves that this type of sensor is applicable in the determination of ferric cations in unknown samples, and the fact that all sensor parts are completely manufactured in our laboratory proves the simplicity of the method.
一种基于磷酸铁和硫化银的新型离子选择性电极，集成到全新的电极体设计中，用于测定三价铁阳离子。在 3.97×10 到 10 mol L 的铁(III)浓度范围内，发现具有线性电位变化的最佳响应特性。检测限为 2.41×10 mol L，斜率为-20.53±0.63，回归系数为 0.9925，而定量限为 3.97×10 M。对于电极体 1（EB1），每浓度十年的电位变化范围为-13.59±0.54 至-20.53±1.56，对于电极体 2（EB2），电位变化范围为-17.28±1.04 至-24±1.87，这是本工作中首次提出的。所制备的电极具有长寿命，并且能够在 20 秒内检测铁阳离子浓度的变化。膜 M1 在测定三价铁标准溶液中的铁阳离子（98.2-101.2%）以及两种不同药物中的铁阳离子（98.6-106.5%）时，回收率较高。这证明了这种传感器适用于测定未知样品中的铁阳离子，并且传感器的所有部件均完全在我们的实验室中制造，这证明了该方法的简单性。
