Adsorption of Inorganic and Organic Arsenic Compounds by Aluminium-loaded Coral Limestone
✍ Scribed by Akira Ohki; Kaori Nakayachigo; Kensuke Naka; Shigeru Maeda
- Publisher
- John Wiley and Sons
- Year
- 1996
- Tongue
- English
- Weight
- 428 KB
- Volume
- 10
- Category
- Article
- ISSN
- 0268-2605
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✦ Synopsis
Coral limestones were treated with an aqueous solution of aluminium sulfate and thereby aluminium-loaded coral limestones (AWL) were prepared. By use of AI-CL as an adsorbent, the adsorption of inorganic arsenic compounds (arsenate [As(V)J and arsenite [As(III)] and of organic arsenic compounds (methylarsonic acid, dimethylarsinic acid, and arsenobetaine) was examined. The adsorption ability of A W L is superior to that of iron(II1)loaded coral limestone (Fe-CL) for As(V), As(III), methylarsonic acid and dimethylarsinic acid. The adsorption of As(V) and As(II1) is almost independent of the initial pH over a wide range (2 or 3 to 11). The addition of other anions, such as chloride, nitrate, sulfate and acetate, in the solution does not affect the adsorption of As(V) and As(III), whereas the addition of phosphate greatly interferes with the adsorption. Arsenic adsorption is effectively applied to a column-type operation and the adsorption capability for As(V) is 150 pg/g coral limestone.