The behavior of H (sub 2) in aqueous fluids under high temperature and pressure
The behavior of H (sub 2) in aqueous fluids under high temperature and pressure
Elements (February 2020) 16 (1): 33-38
- aqueous solutions
- clathrates
- crust
- Eh
- experimental studies
- fugacity
- gas hydrates
- gaseous phase
- geothermal systems
- high pressure
- high temperature
- hydrogen
- immiscibility
- liquid phase
- mantle
- models
- molecular structure
- partitioning
- phase equilibria
- planetary interiors
- pressure
- sodium chloride
- solubility
- solutes
- temperature
- thermodynamic properties
- upper mantle
- water
- water-rock interaction
- critical point
The presence of H (sub 2) and H (sub 2) O in planetary interiors prompts the need for fundamental studies on these compounds under corresponding conditions. Here, we summarize data on H (sub 2) properties in aqueous systems under conditions of high temperature and pressure. We explain how to measure important H (sub 2) fugacities in hydrothermal systems. We present available experimental data and thermodynamic models for H (sub 2) solubility and vapor-liquid partitioning under hydrothermal conditions. In addition, we introduce the fascinating world of H (sub 2) -H (sub 2) O clathrate hydrates under extreme temperatures and pressures. The properties of the H (sub 2) -H (sub 2) O system are well established below the critical point of water (374 degrees C and 22.06 MPa), but far less is known under higher temperatures and pressures, or the effect of salt.
