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Table 6 Calculating apparent constant of Fe(II) and Cr(VI) under different pH conditions

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

CasepHCCr(VI) (mg/L)k (Ms−1)t1/2(s)
Hyproxia3200.1983.502
40.1674.159
50.1594.363
60.1674.159
70.1704.068
80.2382.915
Anoxic3200.1853.751
40.1893.661
50.1534.522
60.1614.295
70.1883.683
80.2103.299