Record Display for the EPA National Library Catalog

RECORD NUMBER: 6 OF 19

OLS Field Name OLS Field Data
Main Title Effects of Humic Substances on Metal Speciation.
Author Perdue, E. M. ;
CORP Author Georgia Inst. of Tech., Atlanta. School of Geophysical Sciences.;Environmental Research Lab., Athens, GA.
Year Published 1987
Report Number EPA/600/D-87/351;
Stock Number PB88-133632
Additional Subjects Water treatment ; Metal complexes ; Humic acids ; Ligands ; Equilibrium ; Concentration(Composition) ; Metal ions
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB88-133632 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/21/1988
Collation 28p
Abstract
The paper addresses some of the problems that must be understood and solved before the effects of metal-humic complexation on water treatment processes can be quantitatively addressed. The heterogeniety of ligands in a humic substance not only complicates the mathematical description of equilibrium data but also makes the complexation capacity of a humic substance almost impossible to accurately determine. Complexation capacities (meq/g) of humic substances are widely reported to vary with pH, ionic strength, concentration of the humic substances used in the measurement, and the nature of the metal being studied. The paper demonstrates that the reported effect of humic substance concentration on complexation capacity is an artifact, and that other effects arise from variations in conditional concentration quotients for metal complexation reactions.