使用基于石墨和炭黑导电油墨的一次性印刷电极电化学测定儿茶酚

Analytica Pub Date : 2024-06-01 DOI:10.3390/analytica5020016
Sthephane Pereira de Oliveira, Thaís Cristina de Oliveira Cândido, Arnaldo César Pereira, Daniela Nunes da Silva
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引用次数: 0

摘要

邻苯二酚(CT)是一种酚类化合物,广泛应用于各个工业部门,但它具有毒性;因此,需要一种方法来识别和量化环境中这种物质的残留。本研究开发了一种一次性印刷电化学传感器,作为测定水样中 CT 的有效替代方法。这种被称为 SPEC 的电极是以聚对苯二甲酸乙二醇酯(PET)为载体,采用丝网印刷法制造的,其中工作电极和辅助电极采用碳质材料导电油墨印刷,参比电极采用银/氯化银油墨印刷。导电墨水的最佳比例为 6.25% 炭黑、35.42% 石墨和 58.33% 指甲油。获得的墨水通过扫描电子显微镜(SEM)进行了表征。pH 值对氧化还原过程的影响评估显示出 Nernstian 行为(0.057 V pH-1),表明该过程涉及相同数量的质子和电子。在 pH 值为 5.0 的 0.2 mol L-1 醋酸缓冲液的优化条件下,通过方波伏安法,传感器的灵敏度值为 0.31 μA L μmol-1,检测限为 5.96 μmol L-1,定量限为 19.87 μmol L-1。该传感器被用于检测自来水样品中的 CT,结果显示回收率在 97.95% 和 100.17% 之间。
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Electrochemical Determination of Catechol Using a Disposable Printed Electrode with Conductive Ink Based on Graphite and Carbon Black
Catechol (CT) is a phenolic compound widely used in various industrial sectors, but it is toxic; thus, there is a need for methods that aim to identify and quantify the existence of residues of this material in the environment. In this study a disposable printed electrochemical sensor was developed as an effective alternative for determining CT in water samples. The electrode, called SPEC, was manufactured using the screen-printing method using polyethylene terephthalate (PET) as a support, in which a conductive ink based on carbonaceous materials was used to print the working and auxiliary electrodes and a silver/silver chloride of ink on the reference electrode. The optimal ratio for the conductive ink was 6.25% carbon black, 35.42% graphite, and 58.33% nail polish. The ink obtained was characterized by scanning electron microscopy (SEM). The assessment of the effect of pH on the redox process showed Nernstian behavior (0.057 V pH−1), indicating that the process involves the same number of protons and electrons. Under optimized conditions, with 0.2 mol L−1 acetate buffer at pH 5.0, and by square wave voltammetry, the sensor presented sensitivity values of 0.31 μA L μmol−1, a detection limit of 5.96 μmol L−1, and a quantification limit of 19.87 μmol L−1. The sensor was applied to determine CT in tap water samples, and the results showed recoveries between 97.95 and 100.17%.
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