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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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Received: 28 December 2007; Accepted: 25 February 2008 / Published: 27 February 2008
Abstract: 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.
Keywords: enzyme biosensor; selectivity; amperometry; formaldehyde; formaldehyde dehydrogenase
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Achmann, S.; Hämmerle, M.; Moos, R. Amperometric Enzyme-based Gas Sensor for Formaldehyde: Impact of Possible Interferences. Sensors 2008, 8, 1351-1365.
Achmann S, Hämmerle M, Moos R. Amperometric Enzyme-based Gas Sensor for Formaldehyde: Impact of Possible Interferences. Sensors. 2008; 8(3):1351-1365.
Achmann, Sabine; Hämmerle, Martin; Moos, Ralf. 2008. "Amperometric Enzyme-based Gas Sensor for Formaldehyde: Impact of Possible Interferences." Sensors 8, no. 3: 1351-1365.