2025-07-11 森林総合研究所
図1. ガスクロマトグラフ法とガスアナライザー法の利点と欠点。
＜関連情報＞
- https://www.ffpri.go.jp/press/2025/20250711/index.html
- https://www.ffpri.go.jp/press/2025/20250711/documents/20250711press.pdf
- https://www.jstage.jst.go.jp/article/ffpri/24/2/24_95/_article
貯蔵ガス試料用のポータブルガス分析器： 密閉チャンバー法におけるガス濃度測定のためのガスクロマトグラフに代わる迅速な方法 Portable gas analyzer for stored gas samples: A rapid alternative to gas chromatograph for determining gas concentrations in closed chamber techniques
Tadashi SAKATA , Taiki MORI , Shoji HASHIMOTO
Bulletin of the Forestry and Forest Products Research Institute Published: June 26, 2025
DOI:https://doi.org/10.20756/ffpri.24.2_95
Abstract
We propose a portable gas analyzer (PGA)-based system for analyzing stored methane (CH4) and carbon dioxide (CO2) samples more rapidly compared to gas chromatography (GC) for application in the closed chamber technique. A gas analysis system was established using an ABB LGR-ICOS gas analyzer, which was connected to a carrier gas flow line with nitrogen as the carrier gas and to a gas injector equipped with a septum. This new system enabled more rapid analysis of CH4 and CO2, within 2 minutes, which was more than three times faster than GC. The linearity of gas measurements using the PGA-based system was evaluated by measuring the peak heights of known concentrations of CH4 and CO2 gases introduced into the system. The results demonstrated excellent linearity, with R² values exceeding 0.998. The repeatability of the gas measurements was high, as indicated by the low coefficient of variation (CV), with all CVs remaining below 3%. To validate the PGA-based system, we compared its results with those obtained from GC. The results from the system showed a high correspondence with the GC measurements, with R² values exceeding 0.995 and the ratio of CH4 and CO2 concentrations measured by the PGA-based system relative to those measured by GC being nearly 100%. Overall, we concluded that the PGA-based system is a robust method for measuring CH4 and CO2 concentrations of stored samples in sealed containers more rapidly compared to GC.
