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首页> 外文期刊>Electroanalysis >Voltammetry of electroinactive species using quinone/hydroquinone redox: A known redox system viewed in a new perspective
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Voltammetry of electroinactive species using quinone/hydroquinone redox: A known redox system viewed in a new perspective

机译：使用醌/对苯二酚氧化还原的伏安法伏安法：以新的视角观察已知的氧化还原系统

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摘要

Electrochemical behavior of p-benzoquinone (Q), hydroquinone (H(2)Q) and quinhydrone complex (QH) have been investigated in aqueous unbuffered solutions. The results revealed that in unbuffered solution the half wave potential of hydroquinone has a significant difference with quinone's half wave potential. It shown that, added acid in an unbuffered solution of Q, give rise to a new reduction peak at a more positive potential than original reduction peak of Q. The half-peak potential of this new peak is dependent on acidity of added acid (pK(a)) and its height is proportional to the acid concentration. Also, added base in an unbuffered solution of H(2)Q, give rise to a new oxidation peak at a more negative potential than original oxidation peak of H(2)Q. The half-peak potential of this new peak is dependent on basicity of added base (pK(b)) and its height is proportional to the base concentration. This paper shows new perspectives for a known system in aqueous unbuffered solutions, by means of voltammetric responses that can be exploited for the electrochemical investigation of non electroactive species such as HPO42-, HCO3- or CH3COOH.
机译：对苯并醌（Q），对苯二酚（H（2）Q）和喹hydr酮络合物（QH）的电化学行为已在无缓冲水溶液中进行了研究。结果表明，在非缓冲溶液中对苯二酚的半波电势与醌的半波电势有显着差异。结果表明，在Q的非缓冲溶液中添加的酸会在比Q的原始还原峰更正的电位上产生一个新的还原峰。该新峰的半峰电位取决于所添加酸的酸度（pK （a）），其高度与酸浓度成正比。此外，在H（2）Q的无缓冲溶液中添加碱，会在比H（2）Q的原始氧化峰更负的电位下产生一个新的氧化峰。这个新峰的半峰电势取决于所添加碱的碱性（pK（b）），其高度与碱浓度成正比。本文通过伏安反应显示了已知系统在无缓冲水溶液中的新观点，该伏安反应可用于非电活性物质（如HPO42-，HCO3-或CH3COOH）的电化学研究。

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