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Laboratory batch and column experiments were performed to better understand the effects of Ca2+, Mg2+, and HCO3− on Cr(VI) removal from aqueous systems with pyrite. Batch results show that increasing HCO3− concentration led to an increase in Cr(VI) removal by pyrite due to pH buffering capacity of HCO3−. However, while Ca2+ and Mg2+ individually had no effect on Cr(VI)...
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