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Table 2 Hydrochemical composition of the fluids used in the heat storage test (ND = not determined)

From: Hydrochemical aspects of high-temperature aquifer storage in carbonaceous aquifers: evaluation of a field study

Parameter Unit Tap Reservoir
EC mS/cm 0.615 1.18
pH   6.92 7.07
Temp °C 13.1 22.7
TDS mg/L 525 922
\(\text {Na}^+\) mmol/L 0.18 7.7
\(\text {K}^+\) mmol/L 0.02 0.40
\(\text {Ca}^{2+}\) mmol/L 1.9 1.1
\(\text {Mg}^{2+}\) mmol/L 1.4 0.97
\(\text {Cl}^-\) mmol/L 0.40 4.1
\(\text {NO}_3^{-}\) mmol/L 0.25 \(<1.6 \cdot 10^{-3}\)
\(\text {SO}_4^{2-}\) mmol/L 0.13 0.21
\(\text {HCO}_3^-\) mmol/L 5.7 7.7
\(\text {CH}_4\) mmol/L ND 2.2
\(\text {N}_2\) mmol/L ND 0.95
Bubble press. bar ND 2.93