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首页> 外文期刊>Electroanalysis >TiO2-modified Carbon Paste Electrode as a Sensor for the Assay of Weak Organic Acids/Bases and Complex Matrix Samples
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TiO2-modified Carbon Paste Electrode as a Sensor for the Assay of Weak Organic Acids/Bases and Complex Matrix Samples

机译：TiO2修饰的碳糊电极作为检测弱有机酸/碱和复杂基质样品的传感器

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摘要

The construction, general performance characteristics and analytical application of a titanium dioxide-modified carbon paste electrode sensitive to hydrogen ions, based on incorporation of titanium dioxide in a carbon paste matrix, is described. The proposed electro-chemical sensor exhibits a linear response in the pH range from 2 to 10, at 25 degrees C, with a sub-Nernstian slope. The value of a slope is in a direct correlation with the electrode composition - the optimum content of a titanium dioxide in carbon paste is 30%. Titanium dioxide-modified carbon paste electrode shows fast response time and reproducibility, confirmed by different compounds determination in both, individual and complex material, namely, in synthetic and real samples. Besides, the electrode shows high selectivity in the presence of the alkali and the alkaline earth ions as Na+, K+, Ca2+ or Mg2+. The standard deviation of the investigated acids (acetic, oxalic, 5-sulfosalicylic, p-toluensulfonic acid, and amino acid-glycine) and bases (N,N'-diphenylguanidine and collidine) is less than 1.3%. The obtained data are compared with those obtained by using a conventional glass pH-electrode under the same experimental conditions and indicate a high correlation between them.
机译：描述了基于在碳糊基质中掺入二氧化钛而对氢离子敏感的二氧化钛改性的碳糊电极的构造，一般性能特征和分析应用。所提出的电化学传感器在25摄氏度下在2到10的pH范围内表现出线性响应，并具有亚能斯特斜率。斜率的值与电极组成直接相关-碳糊中二氧化钛的最佳含量为30％。二氧化钛改性的碳糊电极显示出快速的响应时间和可重复性，这在单独和复杂的材料（即合成样品和真实样品）中通过不同化合物的测定得以证实。此外，该电极在碱金属和碱土金属离子如Na +，K +，Ca2 +或Mg2 +的存在下显示出高选择性。研究的酸（乙酸，草酸，5-磺基水杨酸，对甲苯磺酸和氨基酸甘氨酸）和碱（N，N'-二苯基胍和可力丁）的标准偏差小于1.3％。在相同的实验条件下，将获得的数据与使用常规玻璃pH电极获得的数据进行比较，表明它们之间具有高度相关性。

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