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Table 5 Main cations and anion of selected water samples during experiments C, D and E (mg/L)

From: Hydrogen sulfide removal from geothermal fluids by Fe(III)-based additives

Sample Treatment Na+ K+ Ca2+ Mg2+ HCO3 Cl SO42− Fe
Water Filtered 520 23 430 130 172 860 1400 < 0.02
Water Unfiltered 510 22 420 130 233 800 1300 < 0.02
Exp. C Before addition 510 22 430 120 nm nm 1500 < 0.02
After GFH_1 510 22 430 120 nm nm 1500 4.5
After GFH_2 510 21 420 120 nm nm 1500 10.5
After GFH_2 510 22 430 120 nm nm 1500 < 0.02
Exp. D Before addition 480 21 400 120 nm nm 1500 < 0.02
Before addition 480 20 400 110 nm nm 1400 < 0.02
After GFH 480 20 400 110 nm nm 1400 < 0.02
After GFH 450 18 350 100 nm nm 1200 < 0.02
After GFH 460 19 370 110 nm nm 1300 < 0.02
Before addition 510 22 430 120 nm nm 1500 < 0.02
Exp. E After FeCl3 530 21 420 120 nm nm 1400 6.7
After FeCl3 510 22 420 120 nm nm 1500 < 0.02
After FeCl3 510 22 430 120 nm nm 1400 <0.02
After FeCl3 510 21 420 120 nm nm 1400 2.186
  1. nm not measured