Basic experimental results of liquid CO2 injection into the deep ocean

CO₂ disposal in the deep ocean is expected to be an effective option for mitigating the increase in CO₂ on the earth. The authors have investigated the behaviour of liquid CO₂ using test facilities which can simulate the pressure and temperature of the deep ocean. Phase equilibrium data of the CO₂ -seawater system and the conditions of CO₂ clathrate formation were confirmed. In addition, the authors measured the pH value of seawater saturated with CO₂ at high pressure. The data presented in this paper are considered indispensable for evaluating the possibility of CO₂ disposal in the deep ocean