Constraining the carbonate system in soils via testing the internal consistency of pH, pCO2 and alkalinity measurements

Table 4 Calculated pH (pH_PHREEQC) and calcite, aragonite and dolomite saturation status using the geochemical speciation program PHREEQC

Soil	pH _PHREEQC	SI-Calcite, Aragonite and Dolomite (pH_spec and TA) (mg L⁻¹)	SI-Calcite, Aragonite and Dolomite (pCO₂ and TA) (mg L⁻¹)
Lock Siliceous	8.27	0.28, 0.14, − 0.20	0.54, 0.39, 0.30
Monarto 1	8.36	0.34, 0.19, 0.14	0.62, 0.48, 0.71
Ngarkat	7.41	− 2.5, − 2.7, − 5.20	− 2.20, − 2.3, − 4.4
Modra	7.89	− 0.28, − 0.42, − 1.04	− 0.06, − 0.21, − 0.61
Lock Horizon	8.47	0.25, 0.10, 0.22	0.58, 0.43, 0.88
Karoonda	7.38	− 2.9,− 3.14, − 6.12	− 2.09, − 2.2, − 4.3
Monarto 2	7.51	− 2.4923, − 2.6361, − 5.0855	− 1.7, − 1.8, − 3.5
Cowirra	8.04	0.35, − 0.02, − 0.23	0.64, 0.17, 0.16

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