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首页> 外文期刊>Electroanalysis >Selective determination of catechol in the presence of hydroquinone at bare indium tin oxide electrodes via peak-potential separation and redox cycling by hydrazine
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Selective determination of catechol in the presence of hydroquinone at bare indium tin oxide electrodes via peak-potential separation and redox cycling by hydrazine

机译：通过峰电位分离和肼的氧化还原循环在对苯二酚裸电极上对苯二酚的选择性测定

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摘要

The electrochemical, selective determination of catechol (CT) in the presence of hydroquinone (HQ) is not readily achieved, because the formal potentials of two phenolic compounds are very close. Here, we have developed a simple electrochemical method for the selective determination of CT by using bare indium tin oxide electrodes and employing CT redox cycling by hydrazine. The cyclic voltammetry of CT and HQ was investigated in Tris buffer (pH 9.0), phosphate buffered saline buffer (pH 7.4), and acetate buffer (pH 4.5). Especially in Tris buffer, the anodic peak potential of CT is much lower than that of HQ, resulting in a large difference between two peak potentials (ca. 0.4 V). The difference allows the selective determination of CT in the presence of excess HQ. The anodic current of CT is amplified using CT redox cycling by hydrazine, which also helps to stabilize CT and HQ in Tris buffer for several hours. The detection limits of CT in Tris buffer containing 0.1 inM HQ are 1 mu M and 10 mu M in the presence and absence of hvdrazine, respectivelv
机译：在氢醌（HQ）存在下，电化学，选择性地测定邻苯二酚（CT）并不容易，因为两种酚类化合物的形式势非常接近。在这里，我们开发了一种简单的电化学方法，可通过使用裸露的铟锡氧化物电极并通过肼进行CT氧化还原循环来选择性地确定CT。在Tris缓冲液（pH 9.0），磷酸盐缓冲盐溶液（pH 7.4）和乙酸盐缓冲液（pH 4.5）中研究了CT和HQ的循环伏安法。特别是在Tris缓冲液中，CT的阳极峰值电势远低于HQ的阳极峰值电势，导致两个峰值电势（约0.4 V）之间存在较大差异。差异允许在存在过量HQ时选择性确定CT。使用肼通过CT氧化还原循环放大CT的阳极电流，这也有助于在Tris缓冲液中稳定CT和HQ数小时。在存在和不存在盐酸肼屈嗪的情况下，在含有0.1 inM HQ的Tris缓冲液中CT的检测限分别为1μM和10μM。

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