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

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

Soil pH PHREEQC SI-Calcite, Aragonite and Dolomite (pHspec 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