Abstract
We carried out the simulating experiments of Carbon Dioxide (CO_2) ocean storage with a large high-pressure tank to measure pH change caused by the dissolution of CO_2 from CO_2 drops covered with CO_2 hydrate films. The CO_2 drops were stored at 30MPa, 3 to 6℃ and 8 to 12℃ for 2 days. The experimental results showed the lowering of pH for both temperature regions, then, the experiment at lower temperatures provided smaller pH change than that at higher temperatures. The difference of pH change between these temperature regions agreed with the temperature dependency in the solubility of CO_2 hydrate.
