Analytical Sciences

Extraction of Arsenic(III) with Macroporous Resin Impregnated with Bis(2-ethylhexyl)ammonium Bis(2-ethylhexyl)-dithiocarbamate

Yoshito WAKUI*, Serigne A. NDIAYE**, Hideyuki MATSUNAGA*, Toshirou YOKOYAMA* and Kenichi AKIBA***

*Tohoku National Industrial Research Institute, Nigatake, Miyagino, Sendai 983-8551, Japan
**Faculty of Sciences and Techniques, Universite Cheikh Anta DIOP, Dakar, Senegal
***Institute for Advanced Materials and Processing, Tohoku University, Katahira, Aoba, Sendai 980-8577, Japan

The extraction of arsenic(III) was investigated by using macroporous resin impregnated with a newly synthesized hydrophobic extractant: bis(2-ethylhexyl)ammonium bis(2-ethylhexyl)dithiocarbamate (BBDC). In a preliminary experi-ment on liquid-liquid extraction, arsenic(III) was favorably extracted with BBDC in heptane from acidic to neutral solu-tions; the distribution ratios with 0.01 mol dm -3 BBDC were larger than 10 2.5 at pH 0 - 6. The batchwise extraction of arsenic(III) with the impregnated resin was carried out. The distribution ratio was more than 10 3 in an acidic region, and sharply decreased above pH 8. The collection of a trace amount of arsenic(III) was performed by using the column packed with the impregnated resin as a stationary phase. Then arsenic(III) retained on the column was quantitatively elut-ed out with an alkaline solution. (Keywords: Solvent extraction, arsenic, dithiocarbamate, impregnated resin)

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