Version 1
: Received: 7 October 2024 / Approved: 7 October 2024 / Online: 8 October 2024 (11:19:50 CEST)
How to cite:
Alejo-Sánchez, D.; Schalm, O.; Álvarez-Cruz, A.; Hernández-Rodríguez, E.; Martínez-Laguardia, A.; Kairuz-Cabrera, D.; Morales-Pérez, M. C. Enhancing the Reliability of NO2 Monitoring Using Low-Cost Sensors by Compensating for Temperature and Humidity Effects. Preprints2024, 2024100455. https://doi.org/10.20944/preprints202410.0455.v1
Alejo-Sánchez, D.; Schalm, O.; Álvarez-Cruz, A.; Hernández-Rodríguez, E.; Martínez-Laguardia, A.; Kairuz-Cabrera, D.; Morales-Pérez, M. C. Enhancing the Reliability of NO2 Monitoring Using Low-Cost Sensors by Compensating for Temperature and Humidity Effects. Preprints 2024, 2024100455. https://doi.org/10.20944/preprints202410.0455.v1
Alejo-Sánchez, D.; Schalm, O.; Álvarez-Cruz, A.; Hernández-Rodríguez, E.; Martínez-Laguardia, A.; Kairuz-Cabrera, D.; Morales-Pérez, M. C. Enhancing the Reliability of NO2 Monitoring Using Low-Cost Sensors by Compensating for Temperature and Humidity Effects. Preprints2024, 2024100455. https://doi.org/10.20944/preprints202410.0455.v1
APA Style
Alejo-Sánchez, D., Schalm, O., Álvarez-Cruz, A., Hernández-Rodríguez, E., Martínez-Laguardia, A., Kairuz-Cabrera, D., & Morales-Pérez, M. C. (2024). Enhancing the Reliability of NO2 Monitoring Using Low-Cost Sensors by Compensating for Temperature and Humidity Effects. Preprints. https://doi.org/10.20944/preprints202410.0455.v1
Chicago/Turabian Style
Alejo-Sánchez, D., David Kairuz-Cabrera and Mayra C. Morales-Pérez. 2024 "Enhancing the Reliability of NO2 Monitoring Using Low-Cost Sensors by Compensating for Temperature and Humidity Effects" Preprints. https://doi.org/10.20944/preprints202410.0455.v1
Abstract
The study investigates methods to enhance the reliability of NO2 monitoring using low-cost electrochemical sensors to measure gaseous pollutants in air by addressing the impacts of temperature and relative humidity. The temperature within a plastic container was controlled using an internal mica heater, an external hot air blower or cooling packs, while relative humidity was adjusted using glycerin solutions. Findings indicated that the Auxiliary Electrode (AE) signal is susceptible to temperature and moderately affected by relative humidity. In contrast, the Working Electrode (WE) signal is less affected by temperature and relative humidity; however, adjustments are still required to determine gas concentrations accurately. Tests involving on/off cycles showed that the AE signal experiences exponential decay before stabilizing, requiring the exclusion of initial readings during monitoring activities. Additionally, calibration experiments in zero air allowed the determination of the compensation factor nT across different temperatures and humidity levels. These results highlight the importance of compensating for temperature and humidity effects to improve the accuracy and reliability of NO2 measurements using low-cost electrochemical sensors. This refinement makes the calibration applicable across a broader range of environmental conditions. However, the experiments also show a lack of repeatability of the zero calibration.
Keywords
Calibration; Repeatability; NO2 monitoring; Low-cost sensors; Temperature compensation; Humidity effects
Subject
Environmental and Earth Sciences, Environmental Science
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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