Oxidation of V(IV) by Birnessite: Kinetics and Surface Complexation.

ABSTRACT: Vanadium is a redox-active metal that has been added to the EPA's Contaminant Candidate List with a notification level of 50 μg L^-1 due to mounting evidence that V^V exposure can lead to adverse health outcomes. Groundwater V concentration exceeds the notification level in many locations, yet geochemical controls on its mobility are poorly understood. Here, we examined the redox interaction between V^IV and birnessite (MnO₂), a well-characterized oxidant and a scavenger of many trace metals. In our findings, birnessite quickly oxidized sparingly soluble V^IV species such as häggite [V₂O₃(OH)₂] into highly mobile and toxic vanadate (H_nVO₄^(3-n)-) in continuously

SUBMITTER: Abernathy MJ 

PROVIDER: S-EPMC11938697 | biostudies-literature | 2021 Sep

REPOSITORIES: biostudies-literature