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 | – |  |