Arsenic contamination in drinking water is related to heavy metal toxicity.
In the normal pH conditions of natural water (6-8) only As(V) occur as ion, whereas As(III) exists as unionised form. Most of the treatment techniques based on adsorption, membrane technologies, require ionic form of Arsenic. This is the reason why As(III) is difficult to remove.
In the normal pH conditions of natural water (6-8) only As(V) occur as ion, whereas As(III) exists as unionised form. Most of the treatment techniques based on adsorption, membrane technologies, require ionic form of Arsenic. This is the reason why As(III) is difficult to remove.
Dear Rajib,
A support based on a polystyrene resin covered with manganese has been synthesized. This solid combines oxidation and adsorption properties, which enables it to obtain remarkable adsorption capacities with respect to both As (V) and As (III). This adsorbent eliminates the influence of the oxidation state of arsenic on adsorption, while being very simple preparation and implementation.
With my best regards
Prof. Bachir ACHOUR
Under the normal water pH range of 6.5-8.5, As exists as neutral As (III), under reducing conditions; whereas As (V) exists as singly or doubly charges H2AsO4(-) and H3AsO4(-2) anions in oxidizing waters. Consequently, it follows that removing charged ions, say through ion exchange is easier than removing neutral ions. Hence your observation.
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