title: [Characteristics of water-gas two-phase CO2 transport in unsaturated zone].
abstract: The migration of CO2 in soil was simulated through use of soil column, especially the transformation of CO2 between water and gas phases at wetting front was studied. The soil column in the test was 1 m long and the concentration of CO2 solution was 748 mg/L. Through analysis, it was shown that CO2 migration in water phase was governed by advection, dispersion, reaction and mass transfer between water and gas phases, that in gas phase by advection, dispersion, mass transfer between two phases. Sampling method under dynamic condition of two phase flow in soil column was approached and mass transfer coefficient from water phase to gas phase was determined as 0.00061. This showed that there was certain mass transformation of CO2 from water phase to gas phase and yet it was not so significant. This study can provide the quantitative scientific bases for safety assessment of geological disposal of low and intermediate level radioactive waste and environmental impact assessment of solid waste disposal by landfilling.
authors.affiliation: State Key Joint Laboratory of Environmental Simulation and Pollution Control, Institute of Environmental Science, Beijing Normal University, Beijing 100875, China.
authors.forename: Yanxin
authors.initials: Y
authors.lastname: Yu
authors.forename: Jiajun
authors.initials: J
authors.lastname: Chen
authors.forename: Jinsheng
authors.initials: J
authors.lastname: Wang
authors.forename: Ying
authors.initials: Y
authors.lastname: Yun
authors.forename: Shushen
authors.initials: S
authors.lastname: Li
authors.forename: Zhiming
authors.initials: Z
authors.lastname: Wang
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D002245:Carbon Dioxide / Q000032:analysis* / Q000737:chemistry; D005740:Gases; D012987:Soil / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*; D014867:Water; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D000393:Air Pollutants; D005740:Gases; D012987:Soil; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; D014867:Water; D002245:Carbon Dioxide