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Table 4 Organic and inorganic fluid chemistry of NGB sites (\(\hbox {mg}\,\hbox {L}^{-1}\))

From: Dissolved organic compounds in geothermal fluids used for energy production: a review

Element/ion

NG1

NG2

NG3

NG4

Depth (m)

850

1620

2455

4400

Temperature (\(^{{\circ }}\hbox {C}\))

34

64

98

150

K

379

446

782

2560

Na

690,000

74,700

80,010

33,600

Ca

1360

1540

8409

45,400

Mg

914

1070

1410

233

Sr

39.5

n.m

440

1290

Fe

4.8

31

60

47.1

Li

0.65

n.m

8.3

212

Mn

0.14

1.2

10

131

TDS

187,000

199,000

221,000

265,000

Cl

108,000

116,800

137,000

138,384

Br

62

111

390

215

\(\hbox {SO}_{4}\)

3360

3830

470

94.4

\(\hbox {HCO}_{3}\)

253

247

40

n.m

\(\hbox {NH}_{4}\)

27.2

n.m

n.m

14.2

DOC

4.9

5.16

22.8

23.4

Formate

 (\(\hbox {mg}\,\hbox {L}^{-1}\))

n.d

0.7

0.3

24.7

 (\(\hbox {mg}\,\hbox {C}\,\hbox {L}^{-1}\))

n.d

0.19

0.08

6.6

Acetate

 (\(\hbox {mg}\,\hbox {L}^{-1}\))

n.d

0.9

44.95

1.2

 (\(\hbox {mg}\,\hbox {C}\,\hbox {L}^{-1}\))

n.d

0.37

18.29

0.49

Propionate

 (\(\hbox {mg}\,\hbox {L}^{-1}\))

n.d

n.d

1.4

n.d

 (\(\hbox {mg}\,\hbox {C}\,\hbox {L}^{-1}\))

n.d

n.d

0.69

n.d

\(\sum\)LMWOA

 (\(\hbox {mg}\,\hbox {L}^{-1}\))

 

1.8

46.65

29.77

 (\(\hbox {mg}\,\hbox {C}\,\hbox {L}^{-1}\))

 

0.56

19.09

8.11

  1. DOC, formate, acetate, and propionate (\(\hbox {mg}\,\hbox {C}\,\hbox {L}^{-1}\)) represent the mean values of the production well from organic compound data compiled from Leins et al. (2022). For NG4 the last sample from the pump test in April 2012 was taken (Feldbusch 2015). Inorganic data were compiled from Steintherme.de (2021) (NG1), Seibt et al. (2008) (NG2), Seibt et al. (2000, 2005) (NG3) and Regenspurg et al. (2016) (NG4)
  2. n.m: not measured, n.d: not detected
  3. LMWOA: low molecular weight organic acids