Release of oxide-bound toxic metals by naturally-occurring and contaminant-derived organic compounds: The role of complexant, reductant, and adsorptive characteristics. Final report, July 1, 1994--June 31, 1997 Page: 4 of 18
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INTRODUCTION
Natural organic compounds and contaminant-derived organic compounds can
substantially alter the speciation and geochemical behavior of contaminant metals in
subsurface environments. Our goal, as part of the Co-Contaminant Subprogram, was
to: (i) develop analytical methods for identifying and quantifying organic compounds
affecting toxic metal speciation; (ii) evaluate their reductant, complexant, and
adsorptive characteristics of organic compounds with regards to important
contaminant metals; (iii) determine reaction kinetics, mechanisms, and energetics for
metal-organic interactions; and (iv) provide the basis for predicting toxic metal
oxidation state, speciation, and mobility.
The publications and manuscripts listed in this report serve as the principal
products of this research. Our research group also contributed to the goals of the Co-
Contaminant Subprogram by participating in scientific and planning discussions, by
assisting in the design of experiments in other laboratories, and by performing
laboratory experiments and chemical analyses in support of research performed at
Oak Ridge and PNL.
SUMMARIES OF COMPLETED WORK
Godtfredsen, K.L. and A.T. Stone "Solubilization of Manganese Dioxide-Bound
Copper by Naturally-Occurring Organic Compounds" Environ. Sci. Technol. 28, 1450-
1458 (1994).
Before our work was begun, it was widely understood that
adsorption/desorption reactions control toxic metal and radionuclide migration rates
in the subsurface. The effects of mineral surface properties and inorganic solution
speciation on adsorption/desorption had been extensively explored in carefully-
controlled laboratory experiments. Little was known, however, about the participation
of natural organic compounds and contaminant-derived organic compounds in
adsorption/desorption reactions.
All experiments involving the MnO2-Cu" system began by pre-equilibrating the
adsorbate and the mineral adsorbent for 17 hours. Reaction began by adding
representative low molecular weight organic compounds or natural organic matter
samples; filtration of suspension aliquots and atomic absorption spectrophotometry2
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Stone, A. T. Release of oxide-bound toxic metals by naturally-occurring and contaminant-derived organic compounds: The role of complexant, reductant, and adsorptive characteristics. Final report, July 1, 1994--June 31, 1997, report, December 31, 1997; Baltimore, Maryland. (https://digital.library.unt.edu/ark:/67531/metadc682122/m1/4/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.