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Methodological variation in headspace analysis of liquid samples using electronic nose

Knobloch, Henri; Turner, Claire; Spooner, Andrew and Chambers, Mark (2009). Methodological variation in headspace analysis of liquid samples using electronic nose. Sensors and Actuators B: Chemical, 139(2) pp. 353–360.

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1016/j.snb.2009.03.007
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Abstract

In past years, numerous electronic nose (e-nose) developments have been published describing analyses of solid-, liquid- or gaseous media in microbiological-, environmental-, agricultural- or medical applications. However, little has been reported about complex methodological pitfalls that might be associated with commercially available e-nose technology. In this paper, some of these pitfalls such as temperature, the use of filters and mass flow using different sampling methods (static- and dynamic sampling) are described for two generations of conducting polymer e-noses (ST114/214, CPs, both Scensive Tech. Ltd.). A comparison with metal oxide semiconducting field effect transistor/metal oxide semiconductor (MOSFET/MOS) e-noses regarding stability across replicates and over time was made. Changes in temperature were found to give larger sensor responses, whereas the application of filters led to quantitative and qualitative changes in sensor responses due to a change in mass flow which was also affected by the sampling method. Static sampling provided more stable flows across replicates. Variation was investigated for CPs and MOSFET/MOS e-noses that gave different responses over time and across replicates. These methodological factors cause a lack of stability and reproducibility, demonstrating the pitfalls of e-nose technology and therefore limit their utility for discriminating between samples.

Item Type: Journal Article
Copyright Holders: 2009 Elsevier B.V.
ISSN: 0925-4005
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNot SetUK Department for Environment, Food and Rural Affairs (DEFRA)
Extra Information: Available online 20 March 2009
Keywords: electronic nose; temperature effect; headspace; filter; sampling method
Academic Unit/Department: Science > Life, Health and Chemical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Biomedical Research Network (BRN)
Related URLs:
Item ID: 27031
Depositing User: Claire Turner
Date Deposited: 23 Jan 2011 00:40
Last Modified: 07 Mar 2014 13:32
URI: http://oro.open.ac.uk/id/eprint/27031
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