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

journal contribution
posted on 2018-02-01, 00:00 authored by X Zhang, M Huang, J Zhao, J Liu, Wenrong YangWenrong Yang, K Qu
Herein, an approach for versatile titration by monitoring the chemical reaction process with a developed capacitively coupled contactless conductivity detector (C 4 D) was developed. A disposable glass reaction cell, in which sub-milliliter titrand was loaded, was inserted into the working head stage of the C 4 D. Upon addition of titrant, the ionic strength and/or mobility of components in the solution changed, causing consequently chang e of conductivity. The C 4 D 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.

History

Journal

Measurement

Volume

116

Pagination

458 - 463

Publisher

Elsevier

Location

Amsterdam, The Netherlands

ISSN

0263-2241

Language

eng

Publication classification

C Journal article; C1 Refereed article in a scholarly journal

Copyright notice

2017, Elsevier Ltd.