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

抄録

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 experiment on liquid-liquid extraction, arsenic(III) was favorably extracted with BBDC in heptane from acidic to neutral solutions; 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 10³ 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 eluted out with an alkaline solution.