ラフロン相分離器を用いる8-キノリノールによるコバルト(II)及びニッケル(II)の連続抽出 [in Japanese] Continuous extraction of nickel (II) in the presence of cobalt (II) with 8-quinolinol by a Teflon phase separator [in Japanese]
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A continuous extraction method was applied to separating Co(II) and Ni(II). 8-quinolinol (Ox) was used as extraction reagent because it is a well-known chelate reagent. In the present measurement, the Ox concentration in the extraction solvent was 1.0 × 10<SUP>-4</SUP> mol/l and the pH of the aqueous phase containing the metals was 6.0, which was adjusted with an acetate buffer solution. When the Ox reagent concentration was lower than 5.0×10<SUP>-4</SUP> mol/l, Co(II) and Ni(II) formed CoR<SUB>2</SUB>·2H<SUB>2</SUB>O and NiR<SUB>2</SUB>·HR in the aqueous phase, respectively. Since NiR<SUB>2</SUB>·HR can be extracted more easily than CoR<SUB>2</SUB>·2H<SUB>2</SUB>O, the only NiR<SUB>2</SUB>·HR is extracted using the above - mentioned conditions with present continuous extraction method. As a result of extraction, Ni(II) was carried into the distillation flask and separated from Co(II) in a single operation.
- BUNSEKI KAGAKU
BUNSEKI KAGAKU 46(4), 297-300, 1997-04-05
The Japan Society for Analytical Chemistry