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Main Title Continuous Multiligand Distribution Model Used to Predict the Stability Constant of Cu(II) Metal Complexation with Humic Material from Fluorescence Quenching Data.
Author Grimm, D. M. ; Azarraga, L. V. ; Carreira, L. A. ; Susetyo., W. ;
CORP Author Technology Applications, Inc., Athens, GA. ;Georgia Univ., Athens. Dept. of Chemistry.;Environmental Research Lab., Athens, GA.
Publisher c1991
Year Published 1991
Report Number EPA-R-813461; EPA/600/J-91/216;
Stock Number PB92-101377
Additional Subjects Copper ions ; Humic acids ; Ligands ; Chemical equilibrium ; Fluorescence ; Titration ; pH ; Water pollution ; Reprints ; Stability constants ; Continuous multiligand distribution model
Library Call Number Additional Info Location Last
NTIS  PB92-101377 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 7p
The use of a pH-dependent continuous multiligand distribution model to determine the stability constant between Cu(II) and dissolved humic material is reported. Fluorescence quenching of the humic material by Cu(II) is used to produce spectral titration curves. The values from the titration curves are then fit, by use of a least-squares fitting routine, to the calculated values produced by the model. Three titrations at pH 2.5, 3.5, and 4.5 were conducted using this method, and the observed and calculated values are compared. A single stability constant for Cu(II) with the humic material is reported. The results are compared with those of experiments carried out using a new technique that relies on the spectral properties of the Eu(III) ion to probe metal binding sites in humic material. (Copyright (c) 1991 by the American Chemical Society.)