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Redox Sensors for the Control of Process and Waste Waters

Authors:
Winfried Vonau
Frank Gerlach
Kristina Ahlborn
Sandra Sachse

Keywords: redox potential; sensor; glass membrane; thick film; thin film; potentiometry

Abstract:
The state of waste and process water depending on the particular application can be characterised by quantitative analysis of its composition (e.g., heavy metal ions, nitrate or phosphate) but often, at least in a complementary manner, by determinating of non-specific parameters like electrolytic con-ductivity or redox potential. The latter is usually measured potentiometrically using indicator electrodes of precious metals. However, their application is connected with measurement errors caused by interactions between the media and the noble metal surfaces. Specifically this problem occurs in real media that can be found in process chemistry and in waste water sector, for example. Using electron conducting glass instead of noble metal membranes in potentiometric redox electrodes solves this problem. We present possibilities for their fabrica-tion and results from their use.

Pages: 39 to 42

Copyright: Copyright (c) IARIA, 2014

Publication date: November 16, 2014

Published in: conference

ISSN: 2308-3514

ISBN: 978-1-61208-375-9

Location: Lisbon, Portugal

Dates: from November 16, 2014 to November 20, 2014