How crucial is the impact of calcium on the reactivity of iron-organic matter aggregates? Insights from arsenic

Abstract

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The efficacy of Pb, As(v) and Sb(iii) removal by biochar is determined by solution chemistry

“…16 The complex role of Fe(III)-NOM phases/composites in sorbent performance, and the changing reactivity of these phases with P and Ca has been investigated by few studies and thorough investigation is warranted. [17][18][19][20] How this complexity will affect metal(loid) sorption by BC in waters of diverse ionic composition remains unknown. The complexity and variety in solution composition in the environment necessitates the study of metal(loid) sorption by BC from the perspective of combined factors rather than a single factor.…”

Effects of Calcium on Arsenate Adsorption and Arsenate/Iron Bioreduction of Ferrihydrite in Stimulated Groundwater

“…Calcium is a widely present cation in groundwater [ 19 ]. Previous research about the role of calcium in the migration of arsenic under neutral conditions has mainly focused on simple adsorption by calcium minerals [ 20 , 21 ]; the adsorption of microbiologically induced carbonate precipitation in a highly alkaline groundwater environment [ 22 ]; and increasing the sorption capacity of arsenic through the formation of Fe-OM-Ca ternary complexation [ 23 ]. Both of these processes lead to arsenic removal.…”

Does ultrafiltration kinetics bias iron isotope compositions?

“…Guéguen et al, 2002;, and iv) frontal vacuum and/ or centrifugal ultrafiltration (e.g. Beauvois et al, 2021Beauvois et al, , 2020Guénet et al, 2018;Ilina et al, 2013;Oleinikova et al, 2019Oleinikova et al, , 2017aOleinikova et al, , 2017bPokrovsky et al, 2018). Morgan et al, (2010) studied Fe isotopic fractionation induced by the exchange of organic ligands in Feorganic complexes through a dialysis membrane.…”