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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