Table 3 Composition and properties of the hydrothermal fluid sampled from production well GPK-2 at Soultz-sous-Forêts (France) in 2011.

pH

5.5

Total dissolved solids (g/l)

97

Na (mg/l)

26,677

K (mg/l)

3220

Ca (mg/l)

6880

Mg (mg/l)

124

Cl (mg/l)

58,271

SO₄ (mg/l)

177

SiO₂ (mg/l)

226

Sr (mg/l)

397

Li (mg/l)

152

Br (mg/l)

264

NO₃ (mg/l)

< 0.5

F (mg/l)

1.9

PO₄ (mg/l)

1.4

B (mg/l)

34.7

NH₄ (mg/l)

21.4

Fe (mg/l)

27.6

Mn (mg/l)

14.8

Ba (mg/l)

19.4

As (mg/l)

8.3

Rb (mg/l)

23.5

Cs (mg/l)

14.6

Ge (μg/l)

50.2

Al (μg/l)

42

Zn (μg/l)

2163

Pb (μg/l)

254

Cd (μg/l)

5.8

Co (μg/l)

2.0

Cr (μg/l)

1.0

Cu (μg/l)

3.7

Ni (μg/l)

1.9

Ag (μg/l)

1.1