ジチゾンゲルによる重金属の抽出及び予備濃縮

概要

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Using a column of polystyrene gel beads impregnated with chlorobenzene solution of dithizone, preconcentration of heavy metal ions from dilute aqueous solution was investigated. Cu(II), Cd(II), Zn(II) and Pb(II) were trapped in the column as dithizonate complex when respective solution passed through the column under suitable pH conditions. The original green color of the column turned to brown, orange, red purple and deep red from the top, respectively. Cu(II), Cd(II) and Zn(II) could be back-extracted by simply eluting with 6N hydrochloric acid at a flow rate of (1.0〜1.4) ml/min. Pb(II) was not recovered quantitatively with 6N hydrochloric acid but quantitatively with 1 N hydrobromic acid. Concentration factor for these metal ions ranged from 5 to 30. Nickel(II) reacted only very slowly with dithizone, so that it was separated from other metals. A comparison of column performance with respect to the types of solid support, such as polystyrene-divinylbenzene (2%) copolymer, Shimalite F(support for gas chromatography, Shimadzu Seisakusho Ltd.) and Amberlite XAD-4 (Rohm & Haas Co.), was also made using dithizone, and the first one was found to be most suitable for the present purpose.
1979-03-05