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Amperometric Enzyme-based Gas Sensor for Formaldehyde: Impact of Possible Interferences

Functional Materials, University of Bayreuth, Universitätsstr. 30, 95440 Bayreuth, Germany
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Sensors 2008, 8(3), 1351-1365; https://doi.org/10.3390/s8031351
Received: 28 December 2007 / Accepted: 25 February 2008 / Published: 27 February 2008
In this work, cross-sensitivities and environmental influences on the sensitivityand the functionality of an enzyme-based amperometric sensor system for the directdetection of formaldehyde from the gas phase are studied. The sensor shows a linearresponse curve for formaldehyde in the tested range (0 - 15 vppm) with a sensitivity of1.9 μA/ppm and a detection limit of about 130 ppb. Cross-sensitivities by environmentalgases like CO2, CO, NO, H2, and vapors of organic solvents like methanol and ethanol areevaluated as well as temperature and humidity influences on the sensor system. The sensorshowed neither significant signal to CO, H2, methanol or ethanol nor to variations in thehumidity of the test gas. As expected, temperature variations had the biggest influence onthe sensor sensitivity with variations in the sensor signal of up to 10 % of the signal for 5vppm CH2O in the range of 25 - 30 °C. View Full-Text
Keywords: enzyme biosensor; selectivity; amperometry; formaldehyde; formaldehyde dehydrogenase enzyme biosensor; selectivity; amperometry; formaldehyde; formaldehyde dehydrogenase
MDPI and ACS Style

Achmann, S.; Hämmerle, M.; Moos, R. Amperometric Enzyme-based Gas Sensor for Formaldehyde: Impact of Possible Interferences. Sensors 2008, 8, 1351-1365.

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