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Main Title Voltammetric Methods for Determination of Metal Binding by Fulvic Acid.
Author Wilson, S. A. ; Huth, T. C. ; Arndt, R. E. ; Skogerboe, R. K. ;
CORP Author Colorado State Univ., Fort Collins. Dept. of Chemistry.;Environmental Research Lab., Athens, GA.
Year Published 1980
Report Number EPA-R-805183; EPA-600/J-80-448;
Stock Number PB84-142462
Additional Subjects Complex compounds ; Chelating agents ; Fulvic acid ; Chemical analysis ; Concentration(Composition) ; Metals ; Water pollution ; Reprints ; Water pollution detection ; Anodic stripping voltammetry ; Differential pulse polarography
Library Call Number Additional Info Location Last
NTIS  PB84-142462 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 8p
The use of anodic stripping voltammetry (ASV) and differential pulse polarography (DPP) for the measurement of the concentrations of aquo ions in the presence of fulvic acid, and the subsequent use of these data for estimation of the metal--fulvic acid conditional stability constants, have been evaluated. The results of such measurements for Cd, Cu, Ni, Pb, and Zn, combined with those reported by others, are generally indicative of the adsorption of fulvic acid on the mercury electrodes used, accompanied by the probable formation of metal complexes with the adsorbed fulvic acid so that the stability constants estimated do not appear to be strictly representative of the degree of complexation occurring in the bulk solution. Comparisons are made with stability constants measured by others using other methods which circumstantially support this conclusion. Therefore, it is suggested that the use of ASV and DPP for studying metal binding by fulvic acid be carefully evaluated for each metal of interest. (Copyright (c) 1980 by the American Chemical Society.)