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Comparison of ppb-level gas measurements with a metal-oxide semiconductor gas sensor in two independent laboratories
Linköping University, Department of Physics, Chemistry and Biology, Sensor and Actuator Systems. Linköping University, Faculty of Science & Engineering. Saarland Univ, Germany.
Saarland Univ, Germany.
Bundesanstalt Mat Forsch and Prufung BAM, Germany.
Bundesanstalt Mat Forsch and Prufung BAM, Germany; Fraunhofer Wilhelm Klauditz Inst, Germany.
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2018 (English)In: Sensors and actuators. B, Chemical, ISSN 0925-4005, E-ISSN 1873-3077, Vol. 273, p. 1037-1046Article in journal (Refereed) Published
Abstract [en]

In this work, we use a gas sensor system consisting of a commercially available gas sensor in temperature cycled operation. It is trained with an extensive gas profile for detection and quantification of hazardous volatile organic compounds (VOC) in the ppb range independent of a varying background of other, less harmful VOCs and inorganic interfering gases like humidity or hydrogen. This training was then validated using a different gas mixture generation apparatus at an independent lab providing analytical methods as reference. While the varying background impedes selective detection of benzene and naphthalene at the low concentrations supplied, both formaldehyde and total VOC can well be quantified, after calibration transfer, by models trained with data from one system and evaluated with data from the other system. The lowest achievable root mean squared errors of prediction were 49 ppb for formaldehyde (in a concentration range of 20-200 ppb) and 150 mu g/m(3) (in a concentration range of 25-450 mu g/m(3)) for total VOC. The latter uncertainty improves to 13 mu g/m(3) with a more confined model range of 220-320 mu g/m(3). The data from the second lab indicate an interfering gas which cannot be detected analytically but strongly influences the sensor signal. This demonstrates the need to take into account all sensor relevant gases, like, e.g., hydrogen and carbon monoxide, in analytical reference measurements.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE SA , 2018. Vol. 273, p. 1037-1046
Keywords [en]
Indoor air quality; Volatile organic compounds; Calibration transfer; Selective quantification; Inter-lab comparison
National Category
Other Chemical Engineering
Identifiers
URN: urn:nbn:se:liu:diva-150838DOI: 10.1016/j.snb.2018.06.097ISI: 000441519000130OAI: oai:DiVA.org:liu-150838DiVA, id: diva2:1245928
Note

Funding Agencies|European Union [604311]

Available from: 2018-09-06 Created: 2018-09-06 Last updated: 2018-09-06

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