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Journal of Analytical Methods in ChemistryVolume 2013 2013, Article ID 249752, 8 pages

Research ArticleResearch Center, Department of Chemistry and Biochemistry, and Department of Biology, Tver State Medical Academy, 4 Sovetskaya Street, Tver 170100, Russia

Received 22 May 2013; Revised 5 July 2013; Accepted 8 July 2013

Academic Editor: Christophe A. Marquette

Copyright © 2013 M. V. Miniaev et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Well-known cause of frequent failures of closed oxygen sensors is the appearance of gas bubbles in the electrolyte. The problem is traditionally associated with insufficient sealing of the sensor that is not always true. Study of a typical temperature regime of measurement system based on Clark sensor showed that spontaneous release of the gas phase is a natural effect caused by periodic warming of the sensor to a temperature of the test liquid. The warming of the sensor together with the incubation medium causes oversaturation of electrolyte by dissolved gases and the allocation of gas bubbles. The lower rate of sensor heating in comparison with the medium reduces but does not eliminate the manifestation of this effect. It is experimentally established, that with each cycle of heating of measuring system up to 37°C followed by cooling the volume of gas phase in the electrolyte KCl; 60 g-L; 400 μL increased by 0.6 μL approximately. Thus, during just several cycles it can dramatically degrade the characteristics of the sensor. A method was developed in which the oxygen sensor is heated in contact with the liquid, depleted of dissolved gases, allowing complete exclusion of the above-mentioned effect.





Autor: M. V. Miniaev, M. B. Belyakova, N. V. Kostiuk, D. V. Leshchenko, and T. A. Fedotova

Fuente: https://www.hindawi.com/



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