Redox Dynamic Interactions of Arsenic(III) with Green Rust Sulfate in the Presence of Citrate.

ABSTRACT: Arsenic is a global pollutant. Recent studies found that Fe(II) can oxidize As(III), but the extent of oxidation with mixed-valent iron minerals and the mechanisms involved are unknown. In this study, we investigated whether As(III) can be oxidized under reducing conditions using green rust sulfate (GR-SO₄), an Fe mineral containing both Fe(II) and Fe(III). Batch sorption experiments showed that GR-SO₄ (1 g L^-1) effectively sorbs environmentally relevant concentrations of As(III) (50-500 μg L^-1) under anoxic, neutral pH conditions with and without citrate (50 μM). X-ray absorption near-edge structure spectroscopy analysis at the As K-edge demonstrated that approximately 76% of As(III) was oxidized to As(V) by GR-SO₄. Complete oxidation

SUBMITTER: Biswakarma J 

PROVIDER: S-EPMC11562726 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature