Dissolved gases in groundwater

Patterson CG, Runnells DD. 1992. Dissolved gases in groundwater as indicators of redox conditions. Water-Rock Interaction, Proc Int Symp, 7th 1 517-520. 

Volatilization of a chemical compound is controlled by its vapor pressure, ambient pressures (which vary with depth), and the partial pressures of associated chemicals and dissolved gases in groundwater. Vapor pressure increases with temperature (see Fig. 24.9), and ebullition occurs when the sum of the partial pressures of the chemical compound, water, and associated dissolved gases exceeds hydrostatic plus capillary pressures (Amos et al., 2005). That is, for ebullition to occur, bubbles must form under sufficient vapor pressure to rise to the water table and then overcome the capillary pressures to enter the vadose zone. As a result, evaporation or vaporization may occur below the pure-component boUtng point. 

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