Role of iron in controlling speciation and mobilization of arsenic in subsurface environment

Removal of arsenic from water by electrocoagulation

“…As(III) and As(V) removals by iron oxides normally behave differently at different pH (Edwards, 1994;Hering et al, 1996;Bose and Sharma, 2002). Su and Puls (2001) have reported that As(III) shows greater removal than As(V), and mixture of As(V) and As(III) showed intermediate removal by iron oxides.…”

Surface-complexation modelling for describing adsorption of phosphate on hydrous ferric oxide surface

“…Competitive adsorption of phosphate onto geologic media can enhance the mobility of other metal oxy-ligands such as arsenate and selenate (Manning and Goldberg, 1996;Geelhoed et al, 1997;Jackson and Miller, 2000;Bose and Sharma, 2002;Gao and Mucci, 2001) and the mechanism may be partially responsible for widespread arsenic contamination of ground waters in heavily agricultural areas of Bangladesh and West Bengal (India), although other factors are reported to be causes of arsenic release (Bose and Sharma, 2002;Smedley and Kinniburgh, 2002). Jain and Loeppert (2000) investigated competitive phosphate and arsenate adsorption onto ferrihydrite, and found that phosphate uptake by ferrihydrite surfaces can substantially diminish arsenate sorption, thereby making dissolved arsenate available in solution, and that this effect is highly dependent on both pH and relative ligand activity.…”

"Geological Contamination of Arsenic in Ground Water: A Review"

“…Operation maintenance replacement and removal or used filters in most of the devices has been a setback. The 20,21 Various studies from the researchers observed that withdrawal of arsenic-free groundwater and in-situ treatment is actually based on recharging groundwater into subterranean aquifers. High level of oxygen controls the release of arsenic from soil.…”