Application of metal oxide semiconductor for detection of ammonia emissions from agricultural sources

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dc.contributor.authorMolleman, Bastiaan
dc.contributor.authorAlessi, Enrico
dc.contributor.authorKrol, Dominika
dc.contributor.authorMorton, Phoebe
dc.contributor.authorDaly, Karen
dc.date.accessioned2022-11-29T16:52:37Z
dc.date.available2022-11-29T16:52:37Z
dc.date.issued2022-11-21
dc.descriptionPublication history: Accepted - 17 November 2022; Published online - 21 November 2022.en_US
dc.description.abstractAgricultural emissions of ammonia (NH3) reduce air quality and biodiversity. Measuring the effectiveness of mitigations measures requires rapid monitoring tools, however, conventional methods are labour intensive and costly. This study evaluated the performance of a prototype metal oxide semiconductor (MOS) gas sensor for monitoring NH3. Conventional methods were used to calibrate sensor conductance. The metal oxide semiconductor (MOS) gas sensor was calibrated against NH3 released from a 0.1 M phosphate buffer spiked with ammonium chloride and NH3 released from recently spread cattle slurry. Field measurements using the MOS sensor were compared with values measuring a Bruker Open Path Air Monitoring System. Sensor conductance and NH3 concentration were described using single site Langmuir adsorption model. Field calibrations suggest a higher detection limit above 0.1 ppm and coefficients of determination were 0.93 and 0.89 for sensors 1 and 2, respectively. For prototypes deployed under field conditions, sensitivities of 2.2 and 2.4 with nonlinearity constants of 0.53 and 0.51, were found for sensor 1 and 3 respectively. Average R2 values were 0.88 for sensor 1 and 0.92 for sensor 3. The calibrations were used to calculate NH3 concentrations from slurry emissions using MOS sensor conductance. NH3 concentrations between 0.2 and 1 ppm, were measured with standard deviation of 20% of verified concentrations. The MOS sensor is sensitive enough to detect NH3 emission from agricultural sources with concentrations above 0.2 ppm. Low power and cost of MOS sensors are an advantage over existing techniques.en_US
dc.description.sponsorshipThis work was supported by the European Union’s Horizon 2020 Research and Innovation Programme [grant agreement No. 825325].en_US
dc.identifierhttp://hdl.handle.net/20.500.12518/499
dc.identifier.citationMolleman, B., Alessi, E., Krol, D., Morton, P.A. and Daly, K. (2022) ‘Application of metal oxide semiconductor for detection of ammonia emissions from agricultural sources’, Sensing and Bio-Sensing Research. Elsevier BV. Available at: https://doi.org/10.1016/j.sbsr.2022.100541.en_US
dc.identifier.issn2214-1804
dc.identifier.urihttps://doi.org/10.1016/j.sbsr.2022.100541
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.rights© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/bync- nd/4.0/).en_US
dc.subjectAmmoniaen_US
dc.subjectAgricultureen_US
dc.subjectEmissionen_US
dc.subjectSensoren_US
dc.subjectMetal-oxide semiconductoren_US
dc.subjectCalibrationen_US
dc.titleApplication of metal oxide semiconductor for detection of ammonia emissions from agricultural sourcesen_US
dc.typeArticleen_US
dcterms.dateAccepted2022-11-17
dcterms.dateSubmitted2022-08-11

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