Fig. 10
From: Sources of salinity and arsenic in groundwater in southwest Bangladesh
Eh-pH diagrams calculated in the Geochemists Workbench v. 9 Act2 program using the default thermodynamic database thermo.dat with temperature = 25 °C, pressure = 1.013 bars, and activity of H2O = 1.0. a As speciation. Activity of As species 10−6. b Fe and S species, hematite suppressed, activity of Fe2+ = 10−6, and activity of SO4 2− = 10−4