AMITA JAIN, KLAUS P. RAVEN
Arsenite [As(III)] and arsenate [As(V)] are highly toxic inorganic arsenic species that represent a potential threat to the environment and human health. This study aimed to evaluate the H+/OH- release stoichiometry and changes in surface charge properties of ferrihydrite during the adsorption of arsenite and arsenate across a pH range of 4-10. The experimental methodology facilitated the assessment of bonding mechanisms that are otherwise not directly accessible through standard spectroscopic studies. The findings revealed that arsenate adsorption resulted in net OH- release at pH 4.6 and 9.2, while arsenite adsorption caused net OH- release at pH 9.2 and net H+ release at pH 4.6. The stoichiometry of H+ or OH- release per mole of adsorbed As varied depending on the As surface coverage, indicating distinct mechanisms of arsenic adsorption that prevail at different coverage levels. Notably, during arsenite adsorption at low pH, the oxygen of the Fe-O-As bond was found to remain partially protonated. The results suggest an increasing role of monodentate bonding mechanisms during arsenate adsorption at higher pH levels. Overall, this study provides ancillary evidence supporting the reduced adsorption of arsenite at low pH and of arsenate at high pH.
@article{13064d95-cb55-4d42-9848-0d6d75d70912,
title={Arsenite and arsenate adsorption on ferr (1)},
author={AMITA JAIN and KLAUS P. RAVEN},
year={2026},
language={en}
}TY - JOUR TI - Arsenite and arsenate adsorption on ferr (1) AU - AMITA JAIN AU - KLAUS P. RAVEN PY - 2026 LA - en ER -
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