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Table 7 Standard electrode potential meter

From: Study on the influence mechanism of underground mineral element Fe(II) on Cr(VI) transformation under subsurface and groundwater interaction zones

Acid condition
(a) Fe3+ + e = Fe2+E0 = 0.771 V
(b) O2 + 4H+ + 4e = 2H2OE0 = 1.229 V
(c) Cr2O72− + 14H+ + 6e = 2Cr3+ + 7H2OE0 = 1.33 V
(d) HCrO4 + 7H+ + 3e = Cr3+ + 4H2OE0 = 1.35 V
Basic condition
(a) Cr(OH)3 + 3e = Cr +3OHE0 = − 1.48 V
(b) CrO2 +2H2O + 3e = Cr +4OHE0 = − 1.2 V
(c) Fe(OH)2 + 2e = Fe + 2OHE0 = − 0.877 V
(d) Fe(OH)3 + e = Fe(OH)2 + OHE0 = − 0.56 V
(e) CrO42− + 4H2O + 3e = Cr(OH)3 + 5OHE0 = − 0.13 V
f) O2 + H2O + 4e = 4OHE0 = 0.401 V