Gas-Tight pH Measurements to Assess an Effect of CO2 on Groundwater

8 Pages Posted: 4 Apr 2019 Last revised: 24 May 2019

See all articles by Saeko Mito-Adachi

Saeko Mito-Adachi

Research Institute of Innovative Technology for the Earth (RITE)

Ziqiu Xue

RITE: Research Institute of Innovative Technology for the Earth; Chalmers University of Technology

Bracken Wimmer

affiliation not provided to SSRN

Abbas Iranmanesh

affiliation not provided to SSRN

Hongbo Shao

affiliation not provided to SSRN

Randall Locke II

affiliation not provided to SSRN

Sallie Greenberg

University of Illinois at Urbana-Champaign

Date Written: October 21, 2018

Abstract

Acidification of water by dissolving CO2 may trigger the release of trace metals from rocks. Thus, pH monitoring is considered to be a key to assess effects of CO2 on groundwater. In this study, we examined a methodology to measure pH of deep-fluid samples using a gas-tight technique. We used a Kuster Flow Through Sampler connected to a custom spectrophotometric pH measurement system at the Illinois Basin – Decatur Project (IBDP) site. The fluid pressure was up to 19 MPa. The Kuster sampler is gas-tight, but cannot maintain pressure at the sampling depth when it is retrieved. In addition, the mechanisms used to transfer fluid from the sampler, called transfer heads, add up to 60 mL of dead space to the 1L sample chamber. To minimize effects of the sampler design on pH measurements, inert gasses (N2 and Ar) were used to purge the transfer heads and maintain pressure in the sampler during sample handling at the surface. Our results suggest that gas-tight pH measurement is especially important when the partial pressure of gas is more than the atmospheric condition.

Keywords: geochemical monitoring; leakage; gas-tight technique; colorimetric pH, GHGT-14

Suggested Citation

Mito-Adachi, Saeko and Xue, Ziqiu and Wimmer, Bracken and Iranmanesh, Abbas and Shao, Hongbo and Locke II, Randall and Greenberg, Sallie, Gas-Tight pH Measurements to Assess an Effect of CO2 on Groundwater (October 21, 2018). 14th Greenhouse Gas Control Technologies Conference Melbourne 21-26 October 2018 (GHGT-14) . Available at SSRN: https://ssrn.com/abstract=3366313

Saeko Mito-Adachi (Contact Author)

Research Institute of Innovative Technology for the Earth (RITE) ( email )

9-2 Kizugawadai
Kizugawashi, Kyoto
Japan

Ziqiu Xue

RITE: Research Institute of Innovative Technology for the Earth ( email )

Kyoto, 619-0292
Japan

Chalmers University of Technology

Bracken Wimmer

affiliation not provided to SSRN

No Address Available

Abbas Iranmanesh

affiliation not provided to SSRN

No Address Available

Hongbo Shao

affiliation not provided to SSRN

No Address Available

Randall Locke II

affiliation not provided to SSRN

No Address Available

Sallie Greenberg

University of Illinois at Urbana-Champaign ( email )

601 E John St
Champaign, IL 61820
United States

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