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Related Experiment Video

Updated: Apr 27, 2026

Measuring Dissolved Methane in Aquatic Ecosystems Using An Optical Spectroscopy Gas Analyzer
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A Robust OB-QEPAS Sensor for In-Situ Detection of Dissolved Methane in Natural Waters.

Yingchao Xie1, Yuqing Li2, Shiling Feng2

  • 1School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China.

Analytical Chemistry
|April 25, 2026
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Summary

A new off-beam quartz-enhanced photoacoustic spectroscopy (OB-QEPAS) sensor accurately monitors dissolved methane in aquatic ecosystems. It features active calibration, advanced signal processing, and water vapor correction for reliable, sensitive greenhouse gas detection.

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Spectroscopy

Background:

  • Accurate dissolved methane monitoring is crucial for understanding aquatic greenhouse gas dynamics.
  • Existing in-field detection methods face challenges in sensitivity, anti-interference, and long-term stability.
  • Off-beam quartz-enhanced photoacoustic spectroscopy (OB-QEPAS) offers potential for sensitive gas detection.

Purpose of the Study:

  • To develop a robust OB-QEPAS sensing system for accurate in-field dissolved methane monitoring.
  • To address key challenges including environmental fluctuations, noise, and water vapor interference.
  • To enable reliable quantification of methane dynamics in aquatic ecosystems.

Main Methods:

  • Integrated an active frequency-calibration mechanism for continuous laser modulation tracking to the quartz tuning fork (QTF) resonant frequency.
  • Implemented a moving average and Kalman filtering (MA-Kalman) algorithm to enhance signal-to-noise ratio (SNR) by 9.5 dB.
  • Developed and validated a quantitative water vapor interference correction scheme using an interpolation-based look-up table.

Main Results:

  • Achieved a minimum methane detection limit of 0.2 ppm with excellent linearity (R² = 0.9994) from 10-1000 ppm.
  • Field measurements in Lake Chaohu quantified dissolved methane concentrations from 3.65 to 22.49 ppm with <1% deviation from TDLAS.
  • Successfully resolved methane production (urban eutrophication) and consumption (wetland oxidation) endmembers.

Conclusions:

  • The developed OB-QEPAS sensor provides a high-performance, stable, and sensitive tool for in-field dissolved methane monitoring.
  • The integrated calibration, signal processing, and interference correction strategies overcome critical practical application obstacles.
  • This work offers a generalizable framework for robust optical gas sensors, advancing environmental monitoring and biogeochemical process analysis.