Rs. Juang et Mn. Chen, MEASUREMENT OF BINDING CONSTANTS OF POLY(ETHYLENIMINE) WITH METAL-IONS AND METAL-CHELATES IN AQUEOUS-MEDIA BY ULTRAFILTRATION, Industrial & engineering chemistry research, 35(6), 1996, pp. 1935-1943
Equilibrium constants for the binding of poly(ethylenimine) (PEI) with
metal ions and metal chelates of ethylenediaminetetraacetic acid and
nitrilotriacetic acid in the aqueous sulfate solutions were determined
by batch ultrafiltration (UF) in the pH range of 3.0-3.8. The average
coordination number of PEI groups interacting with one metal ion and
metal chelate was also obtained by varying the initial concentration r
atio of PEI to metal ion. A simple chemical equilibrium model proposed
in this work enabled us to satisfactorily predict the rejection coeff
icient of UF of metal ions and metal chelates in the presence of PEI.
Also, the effect of the formation of soluble hydroxy complexes of meta
l chelates on their retention was emphasized.