室内換気率測定用トレーサガス類のガスクロマトグラフィーによる迅速分析法

概要

論文の詳細を見る
Tracer gases such as SF_6 and CH_4 have often been used to measure infiltration rates of indoor air. These gases have generally been measured by infrared spectroscopic analysis. Use of this method, however, sometimes causes problems because a lot of sample gases are required. On the other hand, a portable gas chromatograph has been developed in our previous work, that is equipped with a short-length capillary column and a micro thermal conductivity detector. This paper then refers to an application of the gas chromatograph to measure several sorts of tracer gases. Study was focused both on the optimum condition of tracer gas analysis and on their calibration method using air as a reference gas. It was consequently found that the introduction of PoraPLOT Q of 8 m length to the capillary column could shorten analysis time up to 1 min to analyze the tracer gases such as CH_4,N_2O, SF_6 and C_2H_4. Thermal response values of the tracer gases against air (nitrogen+oxygen) under the optimum condition were obtained. The determined values of the tracer gases ; using these values, agreed with those using a reference gas mixture. This result suggests that the calibration method by the use of thermal response values of the tracer gases is able to apply to the quantitative analysis of several sorts of tracer gases. It also appeared that the lower limits of detection of N_2O and SF_6 were enhanced to 2 ppm.
社団法人日本分析化学会の論文
1991-12-05