Natural organic matter affects arsenic speciation and sorption onto hematite.

By A. Redman, D. Macalady, D. Ahmann. Environmental Science and Technology, 2002

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Impact of humic/fulvic acid on the removal of heavy metals from aqueous solutions using nanomaterials: a review. (2014, background): “Obvious inhibitory effects were observed in the removal of both As (V) and As (III) by α-Fe2O3 (Redman et al., 2002), Fe3O4 (Yean et al.”
Arsenic removal from water/wastewater using adsorbents--A critical review. (2007, background): “[246] studied the influences of natual organic matter (NOM) samples on the sorption of arsenic onto ematite.”
Effect of magnetite particle size on adsorption and desorption of arsenite and arsenate (2005, background): “Rapid arsenic sorption to metal oxides was observed;(7,8,31) however, the equilibrium time with NOM-coated hematite was much slower than with hematite and the presence of NOM decreased the extent of arsenic sorption.(30) Recently, nanomaterials have been of considerable environmental attention due t”
Aquatic arsenic: toxicity, speciation, transformations, and remediation. (2009, methodology): “Redman et al. (2002) used six different NOM samples from diverse sources of origin to study the effects of NOM on the adsorption of iAsIII and iAsV onto hematite under natural freshwater conditions.”