Abstract
A gas-tight pH measurement is needed to monitor water chemistry at a CO2 geological storage site. In the CO2 reservoirs, the temperature and pressure are generally more than the critical point of CO2 (31.2°C and 7.38 MPa). In this study, a colorimetric pH measurement method was examined up to 20 MPa for future application to various CO2 reservoirs. A mixture of two color indicators, bromocresol green (BCG) and metacresol purple (mCP), was considered to be a suitable measurement method between pH 3 and 9. The uncertainty up to 20 MPa was less than 0.12 pH units without any correction of pressure effects. We demonstrated a pH measurement of formation water at the Nagaoka CO2 post-injection site. The pH measurement was successfully accomplished under a high-pressure condition (ca. 11 MPa) and without degassing of CO2.
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Acknowledgments
This work was financially supported by the Ministry of Economy, Trade and Industry of Japan (METI) under the grant “Development of Safety Assessment Technology for Carbon Dioxide Capture and Storage”. We thank Mr. M. Yotsuya and Ms. H. Kageyama, RITE, for contributing to laboratory experiments and Mr. S. Sakashita, RITE (OYO at present), for arranging the CHDT sampling.
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Mito, S., Okamura, K. & Kimoto, H. Colorimetric pH Measurement of Pressurized Groundwater Containing CO2. ANAL. SCI. 32, 437–442 (2016). https://doi.org/10.2116/analsci.32.437
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DOI: https://doi.org/10.2116/analsci.32.437