||Metal Speciation by Donnan Dialysis.
Cox, J. A. ;
Slonawska, K. ;
Gatchell, D. K. ;
Hiebert, A. G. ;
||Southern Illinois Univ., Carbondale. ;Knox Coll., Galesburg, IL. Dept. of Chemistry.;Environmental Research Lab., Athens, GA.
Chemical analysis ;
Water quality ;
Ion exchanging ;
Chromatographical analysis ;
Donnan dialysis ;
Water pollution detection ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||In Donnan dialysis aqueous samples are separated from receiver electrolytes by an ion exchange membrane. The present work demonstrates that the dialysis of metals into salt solutions occurs in proportion to the sum of the concentrations of the free metal and the metal held in the form of labile complexes; however, with strongly acidic or chelating receivers, the dialysis occurs in proportion to the total soluble metal. Hence, Donnan dialysis provides the basis for a rapid estimation of the total soluble (i.e., free plus labile complexed) metal and nonlabile-complexed metal. The method is demonstrated with Pb, Zn, Cu, and Cd complexes of glycine, humic acid, and nitrilotriacetic acid and is applied to a lake water sample. The results are compared to values obtained from an established approach that utilizes stripping voltammetry and separations with a chelating ion exchange resin.
||Prepared in cooperation with Knox Coll., Galesburg, IL. Dept. of Chemistry.
||Pub. in Analytical Chemistry, v56 n4 p650-653 1984.
|NTIS Title Notes
||Reprint: Metal Speciation by Donnan Dialysis.
|PUB Date Free Form
||7D; 68D; 99A
||Not available NTIS