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Extramural Research

Grantee Research Project Results

Grantee Research Project Results

Transformations of Co(III) and Cr(III) Complexes in Heterogeneous Media

EPA Grant Number: U915777
Title: Transformations of Co(III) and Cr(III) Complexes in Heterogeneous Media
Investigators: Carbonaro, Richard F.
Institution: Johns Hopkins University
EPA Project Officer: Jones, Brandon
Project Period: August 1, 2000 through August 1, 2003
Project Amount: $102,000
RFA: STAR Graduate Fellowships (2000)
Research Category: Academic Fellowships , Engineering and Environmental Chemistry , Fellowship - Civil Engineering



The objective of this research project is to experimentally investigate: (1) the effect of chelating ligands on the adsorption of cobalt(III) and chromium(III) onto transition metal (iron, titanium) oxides; and (2) the effect of chelating ligands on the oxidation of chromium(III) to the hexavalent state by manganese oxides.


Complexes of cobalt(III) and chromium(III) with (amino)carboxylate chelating agents will be synthesized according to methods reported in the literature. Methods for the analysis of these complexes will be developed using capillary electrophoresis (CE). The adsorption of the cobalt(III) and chromium(III) complexes will be studied on transition metal oxides. The mechanism for adsorption also will be investigated by slightly altering the structure of the metal complex.

Expected Results:

It is expected that the oxidation of chromium(III) by manganese oxide will occur at high pH as a result of its increased solubility. Also, the rates of oxidation are expected to vary greatly as a result of these ligands.

Supplemental Keywords:

cobalt(III), chromium(III), ethylenediaminetetraacetic acid, EDTA, nitrilotriacetic acid, NTA, iminodiacetic acid, IDA, oxidation, adsorption, chelating agents, transition metal oxides, manganese oxides, capillary electrophoresis., RFA, Scientific Discipline, INTERNATIONAL COOPERATION, Waste, POLLUTANTS/TOXICS, Remediation, Environmental Chemistry, Chemicals, Hazardous Waste, Chemistry and Materials Science, Hazardous, Environmental Engineering, hazardous waste management, hazardous waste treatment, sediment treatment, electrokinetics, advanced treatment technologies, cobalt, gas sensor technology, Chromium, catalysts, chemical contaminants, capillary electrophoresis, groundwater, heavy metals

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The perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Conclusions drawn by the principal investigators have not been reviewed by the Agency.

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