Files
Document type
ArticleVersion
Published versionPublication date
Publication license
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/216551
Use of metal oxide semiconductor sensors to measure methane in aquatic ecosystems in the presence of cross-interfering compounds
Journal Title
Director/Tutor
Journal ISSN
Volume Title
Related resource
Abstract
Monitoring dissolved methane in aquatic ecosystems contributes significantly to advancing our understanding of the carbon cycle in these habitats and capturing their impact on methane emissions. Low-cost metal oxide semiconductors (MOS) gas sensors are becoming an increasingly attractive tool to perform such measurements, especially at the air-water interface. However, the performance of MOS sensors in aquatic environmental sciences has come under scrutiny because of their cross-sensitivity to temperature, moisture, and sulfide interference. In this study, we evaluated the performance and limitations of a MOS methane sensor when measuring dissolved methane in waters. A MOS sensor was encapsulated in a hydrophobic extended polytetrafluoroethylene membrane to impede contact with water but allow gas perfusion. Therefore, the membrane enabled us to submerge the sensor in water and overcome cross-sensitivity to humidity. A simple portable, low-energy, flow-through cell system was assembled that included an encapsulated MOS sensor and a temperature sensor. Waters (with or without methane) were injected into the flow cell at a constant rate by a peristaltic pump. The signals from the two sensors were recorded continuously with a cost-efficient microcontroller. Tests specifically focused on the effect of water temperature and sulfide interference on sensor performance. Our experiments revealed that the lower limit of the sensor was in the range of 0.1-0.2 μmol L−1 and that it provided a stable response at water temperatures in the range of 18.5-28°C. Dissolved sulfide at a concentration of 0.4 mmol L−1 or higher interfered with the sensor response, especially at low methane concentrations (0.5 μmol L−1 or lower). However, we show that if dissolved sulfide is monitored, its interference can be alleviated.
Subject (English)
Citation
Citation
BUTTURINI, Andrea and FONOLLOSA MAGRINYÀ, Jordi. Use of metal oxide semiconductor sensors to measure methane in aquatic ecosystems in the presence of cross-interfering compounds. Limnology and Oceanography: Methods. 2022. Vol. 20, num. 11, pags. 710-720. ISSN 1541-5856. [consulted: 17 of August of 2026]. Available at: https://hdl.handle.net/2445/216551