Batch and column experiments were conducted on arsenic adsorption from aqueous solution by natural solids to test the feasibility of these materials to act as adsorbent for As removal from groundwater and drinking water. The solids considered were natural hematite and natural siderite. The As species studied were As(Ⅴ), As(Ⅲ) and dimethylarsinic acid (DMA). Arsenic(Ⅲ), As(Ⅴ) and DMA were removed to different extents by the solids studied. The As adsorption took place more slowly on natural hematite and natural siderite compared with ferrihydrite. The results demonstrate that the amount of As removed from As(Ⅲ) batches was greater than that from As(Ⅴ) batches. The highest efficiency for As retention was observed on hematite HIOl in the batch experiments. Siderite used as column filling was more efficient in removing As from water containing the As species studied in comparison with hematite.
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