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Table 4 Effect of groundwater hardness experiment

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

CaseExperiment conditionsCFe(II) (mg/L)CCr(VI) (mg/L)\(C_{{{\text{Ca}}_{2 + } }}\) (mg/L)\(C_{{{\text{Mg}}_{2 + } }}\) (mg/L)\(C_{{{\text{HCO}}_{3}^{ - } }}\) (mg/L)DO
1Blank2020000Hyperoxia
22020000Anoxic
3Only Ca2+20204000Hyperoxia
420204000Anoxic
5Only Mg2+20200400Hyperoxia
620200400Anoxic
7Only HCO320200060Hyperoxia
820200060Anoxic
9Ca2+, HCO3202040060Hyperoxia
10202040060Anoxic