de Oliveira Luiz Henrique, Trindade Magno Aparecido Gonçalves, Angnes Lucio
Faculdade de Ciências Exatas e Tecnologia, Universidade Federal da Grande Dourados, Rodovia Dourados-Itahum, km 12, 79804-970, Dourados, MS, Brazil; Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes, 748 - 05508-000, São Paulo, SP, Brazil.
Faculdade de Ciências Exatas e Tecnologia, Universidade Federal da Grande Dourados, Rodovia Dourados-Itahum, km 12, 79804-970, Dourados, MS, Brazil; UNESP, National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactives (INCT-DATREM), Institute of Chemistry, P.O. Box 355, 14800-900, Araraquara, SP, Brazil.
Talanta. 2025 Jan 1;281:126875. doi: 10.1016/j.talanta.2024.126875. Epub 2024 Sep 14.
In this paper, we present a new design for a chronoamperometric flow cell in which air bubbles do not interfere with the control of potential between the working and reference electrodes. The flow-through dual-detection cell consists of two independent parts: an upper compartment containing a quiescent supporting electrolyte solution and a channel that operates under hydrodynamically controlled conditions. In this system, the working and counter electrodes can be placed directly in contact with both compartments, whereas the reference electrode can be assembled to be either isolated or in contact with the flowing stream channel. The design ensures that the potential applied to the working electrode (controlled in the upper compartment) is similar to the potential applied in the flowing channel. The performance of the proposed flow cell in generating accurate results, even in the presence of air bubbles, was evaluated through successive air-analyte-air injections. In both series where the analyte was introduced, suitable reproducibility was achieved. The robustness of the design was definitively proven by performing a series of measurements in analytical applications for the determination of hydrogen peroxide in antiseptic samples, yielding very satisfactory results.
在本文中，我们提出了一种用于计时电流法流通池的新设计，在该设计中气泡不会干扰工作电极和参比电极之间的电位控制。流通式双检测池由两个独立部分组成：一个上部隔室，其中含有静态支持电解质溶液，以及一个在流体动力学控制条件下运行的通道。在该系统中，工作电极和对电极可直接与两个隔室接触，而参比电极可组装成与流动通道隔离或接触。该设计确保施加到工作电极（在上部隔室中控制）的电位与在流动通道中施加的电位相似。通过连续进行空气-分析物-空气进样，评估了所提出的流通池即使在存在气泡的情况下产生准确结果的性能。在引入分析物的两个系列中，均实现了合适的重现性。通过在分析应用中对防腐样品中过氧化氢的测定进行一系列测量，最终证明了该设计的稳健性，结果非常令人满意。
