Related Experiment Video
Updated: Jan 20, 2026
05:00
Measuring Dissolved Methane in Aquatic Ecosystems Using An Optical Spectroscopy Gas Analyzer
Published on: July 26, 2024
944
Comparison Between Non-Invasive Methane Measurement Techniques in Cattle.
Jagoba Rey1, Raquel Atxaerandio2, Roberto Ruiz2
1Department of Animal Production, NEIKER-Tecnalia, Granja Modelo de Arkaute, Apdo. 46, 01080 Vitoria-Gasteiz, Spain. jrey@neiker.eus.
Animals : an Open Access Journal From MDPI
|August 25, 2019
Summary
Comparing methane measurement devices, the non-dispersive infrared methane analyzer (NDIR) and laser methane detector (LMD) showed moderate agreement but significant differences in variability. Their readings cannot be used interchangeably for methane (CH4) analysis.
Area of Science:
- Environmental Science
- Analytical Chemistry
- Instrumentation
Background:
- Accurate methane (CH4) detection is crucial for environmental monitoring and industrial applications.
- Different methane measurement technologies, such as non-dispersive infrared (NDIR) analyzers and laser methane detectors (LMDs), offer varying capabilities.
- Understanding the agreement and discrepancies between these instruments is essential for reliable data interpretation.
Purpose of the Study:
- To evaluate the agreement between methane (CH4) concentration measurements obtained using a non-dispersive infrared (NDIR) analyzer and a handheld laser methane detector (LMD).
- To assess the repeatability and correlation of CH4 concentration and peak detection between the NDIR and LMD methods.
Main Methods:
- Simultaneous CH4 measurements were conducted using both NDIR and LMD devices, resulting in 164 paired observations.
- Repeatability, correlation coefficients, and concordance correlation coefficients were calculated for CH4 concentration and the number of detected peaks.
- Statistical analysis included repeated measures correlation and individual-level correlation to assess agreement.
Main Results:
- While correlation coefficients for CH4 concentration and peak detection were moderately high, concordance correlation coefficients indicated only moderate agreement.
- Repeatability of CH4 concentration was higher for NDIR, but LMD showed better repeatability for the number of peaks.
- Significant differences were found in population means and variance components for CH4 concentrations between the two instruments.
Conclusions:
- Methane (CH4) concentration measurements from NDIR and LMD instruments are not interchangeable due to differing variabilities.
- Joint use of both methods for applications like genetic selection or mitigation strategies requires addressing identified sources of disagreement.
- Further research is needed to reconcile the discrepancies in between-subject and within-subject variabilities observed between the NDIR and LMD methane measurement techniques.
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