Quantitative monitoring of dissolved gases in a flooded borehole: calibration of the analytical tools | Science and Technology for Energy Transition (STET)

Characterization and Modeling of the Subsurface in the Context of Ecological Transition

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Table 2

PAR as a function of pressure and CO₂ concentration.

Partial pressure of CO₂ (bar)	Dissolved CO₂ concentration^a (mol/kg)	Average peak area ratio^b ()	Standard deviation
3.010	0.1315	0.06957	0.00120
2.500	0.1092	0.05905	0.00116
2.015	0.0880	0.04874	0.00139
1.550	0.0677	0.03872	0.00134
1.043	0.0456	0.02527	0.00121
0.721	0.0315	0.01740	0.00102
0.334	0.0146	0.00794	0.00094
0.115	0.0048	0.00218	0.00126

Calculated from pressure and temperature using Henry’s law constant.

The average peak area ratio is calculated from all experimental data points at equilibrium (Fig. 5). The calibration curve is fitted from all experimental data points, linking the variation of the PAR to the concentration of the dissolved CO₂ (Fig. 6a) or the partial pressure of the CO₂ (Fig. 6b). The uncertainty (1σ) of the predicted CO₂ dissolved concentration and the partial pressure are ±0.003 mol·kg⁻¹ and ±0.05 bar, respectively.

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