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Table 5 Geogenic and anthropogenic contributions to major ion composition of groundwater samples

From: Aqueous chemistry of anthropogenically contaminated Bengaluru lakes

Ion (mg L− 1)

Bengaluru city groundwater samples [36]

IISc groundwater samples [37]

Anthropogenic components ratio (%)a

Average value (mg L− 1)

Geogenic component

Anthropogenic component

Average value (mg L− 1)

Geogenic component

Anthropogenic component

HCO3

341.0

161.7

179.3

165

161.7

3.3

5333

Cl

181.0

14.9

166.1

49.7

14.9

34.8

377

SO42−

88.0

5.1

82.9

11.8

5.1

6.7

1133

Ca2+

117.0

34.6

82.4

38

34.6

3.4

2310

Mg2+

53.0

13.6

39.4

14.8

13.6

1.2

3226

Na+

970.0

27.8

69.2

38.6

27.8

10.8

540

K+

0

5.6

0

 
  1. aEq. (2)