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首页> 外文期刊>International Journal of Electrochemical Science >Exploring pKa of Peroxycitric Acid Coexisting with Citric Acid in Aqueous Solution with Voltmmetric, Potentiometic and Chromatographic Approaches
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Exploring pKa of Peroxycitric Acid Coexisting with Citric Acid in Aqueous Solution with Voltmmetric, Potentiometic and Chromatographic Approaches

机译：伏安，电位和色谱法研究水溶液中柠檬酸与柠檬酸共存的过氧化柠檬酸的pK a

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摘要

pKa value of peroxycarboxylic (OOOH) group of peroxycitric acid (PCA) without separating fromthe coexisting citric acid (CA) in aqueous solution could be successfully determined withvoltammetric, chromatographic and potentiometric titration methods. Effect of solution pH on cyclicvoltammetric reduction of OOOH group of PCA was evaluated. Reversed phase HPLC wasemployed to recognize the pKa zones of PCA and the result was found to support the voltammetricdetermination of the pKa value. pH-metric titrations of CA and the mixture of PCA and CA werecarried out and an independent titration curve of PCA was derived via the interpolation method.Titration results were analyzed by Niels Bjerrum graphical method to estimate the three pKa values foreach of PCA and CA. A brief discussion on the pKa values of PCA is rationally given with the supportof ab initio molecular orbital calculations on the optimized structures of CA and PCA.
机译：用伏安法，色谱法和电位滴定法可以成功测定过氧柠檬酸（PCA）中过氧羧酸（OOOH）基团与水溶液中共存柠檬酸（CA）分离的pKa值。评价了溶液pH对PCA的OHOH组的循环伏安还原的影响。使用反相HPLC识别PCA的pKa区，发现结果支持pKa值的伏安测定。进行pH滴定CA以及PCA和CA的混合物，通过插值法得出PCA的独立滴定曲线。用Niels Bjerrum图解法分析滴定结果，分别估算PCA和CA的三个pKa值。借助CA和PCA优化结构的从头算分子轨道计算，可以合理地简要讨论PCA的pKa值。

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