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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 componentAnthropogenic componentAverage value (mg L− 1)Geogenic componentAnthropogenic component
HCO3341.0161.7179.3165161.73.35333
Cl181.014.9166.149.714.934.8377
SO42−88.05.182.911.85.16.71133
Ca2+117.034.682.43834.63.42310
Mg2+53.013.639.414.813.61.23226
Na+970.027.869.238.627.810.8540
K+05.60 
  1. aEq. (2)