Monitoring acid-base, precipitation, complexation and redox titrations by a capacitively coupled contactless conductivity detector

文献类型： 外文期刊

第一作者： Zhang, Xuzhi

作者： Zhang, Xuzhi;Huang, Mengshi;Zhao, Jun;Qu, Keming;Huang, Mengshi;Liu, Jingquan;Yang, Wenrong

作者机构：

关键词： Micro-titration; Capacitively coupled contactless conductivity detector; Endpoint detection; Multifunctional platform; Simple titration

期刊名称：MEASUREMENT （ 影响因子：3.927； 五年影响因子：3.778 ）

ISSN： 0263-2241

年卷期： 2018 年 116 卷

页码：

收录情况： SCI

摘要： Herein, an approach for versatile titration by monitoring the chemical reaction process with a developed capacitively coupled contactless conductivity detector ((CD)-D-4) was developed. A disposable glass reaction cell, in which sub-milliliter titrand was loaded, was inserted into the working head stage of the (CD)-D-4. Upon addition of titrant, the ionic strength and/or mobility of components in the solution changed, causing consequently change of conductivity. The (CD)-D-4 monitored the change in real time. A V-shaped titration curve was gained, allowing an easy identification of the endpoint. Between the elapsed time and the initial concentration of titrand, linear relationships were found for classical acid-base, precipitation, complexation and redox reaction over certain ranges, enabling the establishment of quantitative determinations. The new approach had a few charming advantages (e.g. simplicity and cost effectiveness) over contact electrochemical methods because that the solution was isolated from the working electrodes. Therefore, a development of versatile and multifunctional platform for micro-titrations is promising.

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