Abstract
The method of sampling and analysis for underground gas is not yet establiished, in spite of that the gases encountered at underground work are not in single-component but multi-components in many cases. In this study, we propose 1) BAT System developed by B. A. Torstenssen, Sweden, is effeffecttive for underground gas sampling and 2) quick quantitative evaluation of all components in respective phases can be achieved through monitoring on the basis of phase equilibrium theory of non-reactive underground gas sampled. Furthermore, we found each component in respective phase can be represented in temperature-pressure relation assuming mole fraction of gas component is same. Consequently, concentration of underground gas became able to be predicted precisely regardless if the ground is saturated or not.
