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Arsenic sorption on metal oxy hydr oxides

Arsenic is most prone to form surface complexes by adsorption on metal (mostly iron and manganese) (oxy)(hydr)oxides, followed by clays and feldspars (Lin and Puls, 2003). As discussed in Chapters 3 and 7, iron (oxy)(hydr)oxides are groups of Fe(III) Fe(II) (hydrous) oxides, (hydrous) hydroxides, and (hydrous) oxyhydroxides. Individual compounds, such as ferrihydrite, often have highly variable and [Pg.305]

Of the metal sorbents, amorphous to poorly crystalline iron (oxy)(hydr)oxides are most efficient at sorption because of their large surface areas (Chapters 2,3, and 7). However, as these compounds crystallize into hematite, magnetite, or other minerals, their surface areas decrease. Although the affinity of the iron (oxy)(hydr)oxides to sorb arsenic may not always change very much as a result of crystallization (Dixit and Hering, 2003), the reduction of surface area may lead to the release of surface-complexed arsenic (O Shea, 2006). Smedley and Kinniburgh (2002) provide a detailed list of sorption studies dealing with metal (oxy)(hydr)oxides (Table 6.1). [Pg.306]


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Arsen -oxid

Arsen -oxide,

Arseneous oxide

Arsenic oxides

Arsenous Oxide

Metallic arsenic

Metals arsenic

Oxidation on metal oxides

Oxidation sorption

Oxide on metals

Oxides sorption

Oxy metalation

Sorption on oxides

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