The sorption of a number of metal ions on the strong-base resin AG 1 X 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 1:2 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
Sorption of Copper, Nickel and Lanthanum on a strong base anion exchange resin containing Chromotrope 2B.
PESAVENTO, MARIA;BIESUZ, RAFFAELA
1991-01-01
Abstract
The sorption of a number of metal ions on the strong-base resin AG 1 X 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 1:2 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 coefficientsI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
