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× 10⁻⁵ to 10⁻² mol L⁻¹. The detection limit was found to be 2.41× 10⁻⁵ mol L⁻¹ with a slope of –20.53 ± 0.63 and regression coefficient of 0.9925, while the quantification limit was 3.97× 10⁻⁵ 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.

中文翻译：

---

磷酸铁的固态传感器的铁电位法测定铁（III）

已开发出一种新型的离子选择电极，该膜具有基于磷酸铁（III）和硫化银的膜，并集成到全新的电极体设计中，用于测定铁（III）阳离子。在铁（III）浓度范围为3.97×10 ^-5到10 ^-2 mol L ^-1时，发现具有线性电位变化的最佳响应特性。检出限为2.41×10 ^-5 mol L ^-1，斜率为–20.53±0.63，回归系数为0.9925，而定量限为3.97×10 ^-5M.电极体1（EB1）的每浓度十年的电位变化范围为–13.59±0.54至–20.53±1.56，电极体2（EB2）的范围为–17.28±1.04至–24±1.87。第一次从事这项工作。制备的电极寿命长，能够检测20 s内铁阳离子浓度的变化。在测定铁（III）标准溶液（98.2-101.2％）和两种不同药物（98.6-10.65％）中的铁阳离子时，膜M1的回收率很高。这证明该类型的传感器适用于测定未知样品中的三价铁离子，并且所有传感器部件均在我们的实验室中完全制造，这一事实证明了该方法的简便性。