In this study, 19.2 �M Cr(VI) was reacted with 0.5 g/L zerovalent magnesium (ZVM) particles in 10 mM NaCl electrolyte at the initial pH 2.0 - 6.8. The pH was not controlled further because of the oxidative dissolution of ZVM consuming proton, which could not be effectively buffered even at 500 mM MOPS. During the reaction, all of the initial pHs increased and reached a plateau at 10.3 � 0.2 within 200 min. The concentration of Cr(VI) decreased below the detection limit (10 ppb) within 5 min at the initial pH 2 and more slowly at higher pHs. At the initial pH = 4, Cr(VI) was removed in the same rate regardless of the initial pH because the pH rapidly reached at a similar value (~ 10). The results of this study indicate that the removal of Cr(VI) by ZVM can be achieved in a wide range of pH.

Effects of pH on Cr(VI) reduction by zerovalent magnesium in water

243rd National Meeting (2012)

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