MATEC Web of Conferences
Volume 39, 20162015 2nd International Conference on Chemical and Material Engineering (ICCME 2015)
|Number of page(s)||4|
|Section||Material measuring method and application|
|Published online||13 January 2016|
Comparative study of gas diffusion in subsurface using dual-gas tracer SF6 and halon 1211
Northwest Institute of Nuclear Technology, 710024 XI’AN, China
a Corresponding author: firstname.lastname@example.org
Field experiment and soil column test were performed to study the gas diffusion in the soil subsurface using dual-gas tracer SF6 and halon 1211. Gas samples collected from pre-set sampling sites were measured. These two tracer gases showed the similar trend. At the different directions from injecting site, concentrations increased rapidly at the beginning, the peak value concentration of SF6 was higher than that of halon 1211, implied SF6 diffuse further. At the different depth from injecting site, tracer gases preferred to transport horizontal or downwards rather than upwards, meant gravity settling was an important factor affecting the gas diffusion. The effect of temperature and water content on the gas diffusion revealed that gases migrated fast obviously with the temperature increase, the change of water content had influence slightly. Gas desorption test indicated that much more halon 1211 was adsorbed on the soil, which led the diffusion process slow down.
© Owned by the authors, published by EDP Sciences, 2016
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