Sorption of copper, nickel and lanthanum on a strong-base anion exchanger containing Chromotrope 2B
✍ Scribed by Maria Pesavento; Raffaela Biesuz
- Publisher
- Elsevier Science
- Year
- 1991
- Weight
- 640 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0923-1137
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✦ Synopsis
The sorption of a number of metal ions on the strong-base resin A G 1 × 8 containing the azo-dye Chromotrope 2B has been studied using conventional analytical methods. While lead, cadmium, zinc and magnesium are not sorbed, copper, lanthanum and nickel are. The sorption of nickel was unexpected because complexation in water is negligible. In the resin phase a 1 : 2 complex was found For copper both the 1 : 1 and 1 : 2 complexes are formed depending on the ligand concentration in the resin. Evidently, the high ligand concentration in the resin promotes the formation of the 1 : 2 complex. For lanthanum also 1 : 1 and i : 2 complexes are formed The experimentally determined extraction coefficients can be related to the intrinsic formation constants with the aid of the Donnan equilibrium. A good agreement is found for the 1 : 1 complexes of copper and lanthanum, but not for the 1:2 complex of lanthanum, probably due to large differences in the activity coefficients.