Abstract Clinoptilolite nanoparticles (NClin) were Fe(II)-exchanged and used for the modification of carbon paste electrode (Fe(II)-NClin-CPE) in indirect determination of iodate. The voltammetric peak current of Fe(II)/Fe(III) redox system was decreased in the presence of iodate in solution. Sufficient characterization was applied for the raw and modified zeolite and CPE. The electrochemical impedance spectroscopy (EIS) confirmed that Fe(II)-NClin/CPE had the best charge transfer ability with respect to the raw CPE and NClin/CPE. The simultaneous effects of the most important influencing variables of square wave voltammetry (modifier%, solution pH, step potential and amplitude) were studied by designing the experiments by using response surface methodology (RSM). The optimal run obtained at pH 2.18, amplitude = 0.472 V, modifier% = 17.5 and step potential = 0.0202 V. Under the optimum conditions, the current response of Fe(II)-NClin/CPE was inversely proportional to IO3− concentration in the range of 4–100 μmol L− 1 with a detection limit of 0.64 μmol L− 1. Capability of the modified electrode for the determination of iodate in iodofolic pharmaceutical tablet was studied and the obtained results were statistically compared with the results obtained by iodometric titration as a standard method.

中文翻译：

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沸石修饰电极在碘酸盐伏安法测定中的间接应用

摘要 斜发沸石纳米颗粒 (NClin) 经 Fe(II) 交换，用于修饰碳糊电极 (Fe(II)-NClin-CPE)，间接测定碘酸盐。在溶液中存在碘酸盐时，Fe(II)/Fe(III)氧化还原系统的伏安峰值电流降低。对原始沸石和改性沸石和 CPE 进行了充分的表征。电化学阻抗谱 (EIS) 证实 Fe(II)-NClin/CPE 相对于原始 CPE 和 NClin/CPE 具有最佳的电荷转移能力。通过使用响应面法 (RSM) 设计实验，研究了方波伏安法最重要的影响变量（改性剂%、溶液 pH 值、阶跃电位和振幅）的同时影响。在 pH 2.18、振幅 = 0.472 V、改性剂% = 17 下获得最佳运行。