Selection of the receiver electrolyte for the Donnan dialysis enrichment of cations
- 1 January 1984
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in The Analyst
- Vol. 109 (12) , 1603-1605
- https://doi.org/10.1039/an9840901603
Abstract
The Donnan dialysis of cations is typically performed with a sulphonated ion-exchange membrane. Factors that govern the selection of the receiver electrolyte when such membranes are used are described. In terms of providing high enrichment factors that are similar for a variety of cations and constituting a medium that is compatible with various quantification methods, a mixture containing 0.2 M MgSO4 and 0.5 mM Al2(SO4)3 at pH 1 is the recommended electrolyte. For use with cadmium and copper ion-selective electrodes, the pH is adjusted to 3.5–4 after the dialysis. For quantification with a lead ion-selective electrode, the receiver consists of the nitrate salts of Mg(II) and Al(III).Keywords
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