Record Display for the EPA National Library Catalog


Main Title Metal Speciation by Donnan Dialysis.
Author Cox, J. A. ; Slonawska, K. ; Gatchell, D. K. ; Hiebert, A. G. ;
CORP Author Southern Illinois Univ., Carbondale. ;Knox Coll., Galesburg, IL. Dept. of Chemistry.;Environmental Research Lab., Athens, GA.
Year Published 1984
Report Number EPA-R-809397; EPA/600/J-84/072;
Stock Number PB84-233428
Additional Subjects Dialysis ; Chemical analysis ; Water quality ; Metals ; Ion exchanging ; Chromatographical analysis ; Sampling ; Concentration(Composition) ; Lakes ; Cadmium ; Copper ; Lead(Metal) ; Zinc ; Separation ; Reprints ; Donnan dialysis ; Water pollution detection ; Voltammetry
Library Call Number Additional Info Location Last
NTIS  PB84-233428 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 6p
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.