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Solvent Extraction of Arsenic(V) with Dispersed Ultrafine Magnetite Particles

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Abstract

The solvent extraction of arsenic(V) was investigated using heptane containing ultrafine magnetite particles and hydrophobic ammonium salt. Arsenic(V) was favorably extracted from aqueous solutions of pH ranging over 2-7, where the distribution ratio (103) was independent of the pH. Although the addition of alkyl ammonium salt improved the phase separation, no notable influence was observed on the extraction of arsenic(V). Oleic acid suppressed the distribution ratio of arsenic(V) when the concentration exceeded 10-2 M. Sulfate did not interfere with the extraction, while the presence of more than 10-3 M phosphate decreased the distribution ratio. Metal cations including calcium(II), manganese(II), cobalt(II), nickel(II), copper(II), zinc(II) and lanthanum(III) did not give any serious interference up to the 10~4 M level. According to equilibrium and kinetic studies, the extraction of arsenic(V) can be interpreted by the adsorption of H2As04- onto the surface of dispersed magnetite particles. The relationship between the amount of arsenic(V) extracted in the organic phase and that remaining in an aqueous phase followed a Langmuir-type equilibrium equation. The maximum uptake capacity was determined to be 4.8 x ICH mol/g-magnetite (36 mg As/g). The arsenic(V) extracted in the organic phase was quantitatively recovered by back-extraction with an alkaline solution.

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Authors and Affiliations

  1. National Institute of Advanced Industrial Science and Technology (AIST), 4-2-1, Nigatake, Miyagino, Sendai, 983-8551, Japan

    Yoshito Wakui, Takeo Ebina, Hideyuki Matsunaga & Toshishige M. Suzuki

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  1. Yoshito Wakui
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  2. Takeo Ebina
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  3. Hideyuki Matsunaga
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  4. Toshishige M. Suzuki
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Wakui, Y., Ebina, T., Matsunaga, H. et al. Solvent Extraction of Arsenic(V) with Dispersed Ultrafine Magnetite Particles. ANAL. SCI. 18, 793–798 (2002). https://doi.org/10.2116/analsci.18.793

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  • DOI: https://doi.org/10.2116/analsci.18.793

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