锰沸石/石墨修饰玻碳电极：制备，表征和分析应用。,Electroanalysis

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锰沸石/石墨修饰玻碳电极：制备，表征和分析应用。
Electroanalysis ( IF 2.7 ) Pub Date : 2020-01-27 , DOI: 10.1002/elan.201900744
Radosław Porada ₁ , Katarzyna Fendrych ₁ , Bogusław Baś ₁

Affiliation

在这项工作中，低成本和环保的天然沸石与Mn ^2+进行了交换阳离子首次用于修饰玻碳电极，目的是获得用于快速测定对乙酰氨基酚（PAR）的快速简便的传感器。Mn-沸石/石墨改性玻璃碳电极（MnZG-GCE）是通过将沸石/石墨混合物与聚合物在丙酮中的分散液中的溶剂蒸发而制得的。MnZG-GCE的电化学特性通过电化学阻抗谱和循环伏安法进行。与石墨改性的GCE（G-GCE）相比，MnZG-GCE具有更好的电化学参数，这证实了在所提出的传感器中应用沸石的优越性。对支持电解质的pH值和仪器参数进行了优化。^-1（R = 0.9997），检出限为8.8μgL ^-1。最后，所提出的电极已成功地用于测定药物制剂和经认证的参考物质中的扑热息痛。所有研究样品的回收率均在89.2％至102.7％之间。它证实了相对便宜，易于制造且无毒的MnZG-GCE对测定复杂基质中的PAR的吸引力。

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The Mn‐zeolite/Graphite Modified Glassy Carbon Electrode: Fabrication, Characterization and Analytical Applications

In this work, low‐cost and environmentally friendly natural zeolite exchanged with Mn²⁺ cations was used for the first time to modify the glassy carbon electrode with the aim to obtain a fast and simple sensor for voltammetric determination of paracetamol (PAR). The Mn‐zeolite/graphite modified glassy carbon electrode (MnZG−GCE) was prepared by evaporation of solvent from dispersion of the zeolite/graphite mixture with the polymer in acetone. The electrochemical characteristics of MnZG−GCE were conducted by electrochemical impedance spectroscopy and cyclic voltammetry. Compared with graphite modified GCE (G−GCE), MnZG−GCE exhibited better electrochemical parameters, which confirms the superiority of applying zeolite in the proposed sensor. The optimization of the pH‐value of supporting electrolyte and instrumental parameters were carried out. The peak current was proportional to the concentration of PAR in a phosphate buffer saline of pH 6.0 in the range from 0.029 to 0.69 mg L⁻¹ (R=0.9997) with limit of detection of 8.8 μg L⁻¹. Finally, the proposed electrode was successfully applied to determine the paracetamol in pharmaceutical formulation and certified reference materials. The satisfactory recoveries, which ranged from 89.2 to 102.7 %, were obtained for all studied samples. It confirmed the attractiveness of relatively inexpensive, easy to fabricate and non‐toxic MnZG−GCE in determination of PAR in complicated matrixes.

更新日期：2020-01-27

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