Abstract

This paper presents a simple, inexpensive, and highly sensitive electrochemical sensor based on new polymeric membrane incorporating kinetin (6-furfurylaminopurine) as a specific sensitive molecule deposited on the surface of a glassy carbon electrode for the detection of cadmium in water. The electrochemical characterization was examined using electrochemical impedance spectroscopy and cyclic voltammetry. Additive effect and selectivity for cadmium over many common cations, such as copper, lead, and zinc, at pH 4.5 are studied. We showed that the cadmium selectivity is better for membrane based on potassium tetrakis(4-chlorophenyl)borate (KTpClPB) with a significant decrease of the R_ct and an increase in constant phase element CPE, the sensor exhibits a LOD of 3.96 × 10^–10 M with a linear response towards cadmium ions over a wide concentration range of 10^–6 to 10^–9 M. Finally, the proposed sensor was applied to the determination of cadmium in water and can be proposed to use successfully in real water samples.

Graphic abstract

中文翻译：

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基于6-糠基氨基嘌呤配体的新型选择性修饰玻碳电极用于实际样品中的镉检测

摘要

本文提出了一种简单，廉价且高度灵敏的电化学传感器，该传感器基于新的聚合物膜，其中结合了激动素（6-糠基氨基嘌呤）作为沉积在玻璃碳电极表面的特定敏感分子，用于检测水中的镉。使用电化学阻抗谱和循环伏安法检查电化学表征。研究了pH值为4.5时，镉对许多常见阳离子（如铜，铅和锌）的累加效应和选择性。我们发现，基于四（4-氯苯基）硼酸钾（KTpClPB）的膜，镉的选择性更好，R _ct显着降低，恒定相元素CPE升高，传感器的LOD为3.96×10 ^{– 10} M在10 ^–6到10 ^–9  M的宽浓度范围内对镉离子具有线性响应。最后，该传感器被用于测定水中的镉，并且可以成功应用于实际水样中。

图形摘要