Abstract
Abstract A two-level seven-factor (2 7-2 ) fractional factorial design analysis was conducted to examine the parameters influencing dimethylarsinic acid (DMA) removal from an aqueous solution using iron oxide-coated A. niger biomass. The factors examined were the concentration of DMA in solution, the mass of the adsorbent, the solution temperature, the Ca 2+ ions in solution, the Fe 2+ ions in solution, the SO 4 2− ions in solution, and the Cl − ions in solution. The magnitude of the influence of the factors considered on DMA removal was observed in the order: presence of Ca 2+ ions in solution > the DMA concentration > solution temperature > presence of SO 4 2− in solution > presence of Fe 2+ in solution > the mass of adsorbent > the presence of Cl − in solution.
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