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首页> 外文期刊>Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement >Comparison of three electrochemical end-point detection methods to assay potassium dichromate by coulometric titration
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Comparison of three electrochemical end-point detection methods to assay potassium dichromate by coulometric titration

机译：库仑滴定法测定重铬酸钾的三种电化学终点检测方法的比较

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摘要

Coulometric titrations with three electrochemical end-point detection methods were performed to assay potassium dichromate as a standard for oxidation–reduction titration. The assay as an oxidizing agent was carried out with ferrous ions produced by electrolytically reducing ferric ions. Three end-point detection methods were employed and compared with each other: constant potential amperometry, potentiometry, and constant voltage biamperometry (a dead-stop method). The last one was found to provide high accuracy in the coulometric titration of potassium dichromate. Solution form samples were also measured to confirm the possible existence of chromium(III) in potassium dichromate by both coulometric titration and ion-exchange chromatography with inductively coupled plasma time-of-flight mass spectrometry.
机译：用三种电化学终点检测方法进行库仑滴定，以测定重铬酸钾作为氧化还原滴定的标准。使用通过电解还原三价铁离子产生的亚铁离子作为氧化剂进行分析。使用了三种端点检测方法，并将它们相互比较：恒电位安培法，电位计和恒压双安培法（死停法）。发现最后一种在库仑滴定重铬酸钾中提供了高精度。还通过溶液滴定和离子交换色谱-电感耦合等离子体飞行时间质谱法对溶液形式的样品进行了测定，以确认重铬酸钾中可能存在铬（III）。

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