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Extramural Research

Grantee Research Project Results

Grantee Research Project Results

Modeling Lead Binding to Metal Oxide and Organic Compounds of Particulate Material in Natural and Engineered Aquatic Environments

EPA Grant Number: U914759
Title: Modeling Lead Binding to Metal Oxide and Organic Compounds of Particulate Material in Natural and Engineered Aquatic Environments
Investigators: Nelson, Yarrow M.
Institution: Cornell University
EPA Project Officer: Broadway, Virginia
Project Period: January 1, 1995 through January 1, 1996
Project Amount: $102,000
RFA: STAR Graduate Fellowships (1995)
Research Category: Academic Fellowships , Engineering and Environmental Chemistry , Fellowship - Engineering

Description:

Objective:

The objective of this research project is to examine the role of surface coating composition in controlling trace metal adsorption in aquatic environments.

Approach:

Pb adsorption was investigated using natural biofilms that developed on glass surfaces in three New York lakes and a water supply well. Adsorption isotherms were obtained for Pb binding to the biofilms in solutions with defined Pb speciation at 25°C and pH 6.0, with Pb2+ concentrations ranging from 0.1 to 2.0 µM. Adsorption isotherms for Pb binding to representative individual components of the biofilms also were determined under the same conditions. These isotherms, combined with characterization of the natural biofilm composition, were used to estimate the relative contributions of the organic and metal oxide surface coating constituents. Laboratory analogs for the organic phase of the biofilms were cells of a diatom (Navicula peliculosa) and a green alga (Chlorella vulgaris) and extracellular polymer of the bacterium Burkholdaria cepacia. The laboratory surrogates used for biofilm minerals were oxides of Fe, Mn, and Al. Pb binding to Fe oxides in the natural biofilms was estimated to be an order of magnitude greater than Pb binding of the organic phase or the Mn and Al oxides. The sum total of predicted Pb binding to Fe, Mn, and Al oxides and the organic phase accounted for 80 to 90 percent of the total observed Pb binding in the oligotrophic biofilms, and 40 to 60 percent of that observed for biofilms from the more productive lakes.

Supplemental Keywords:

fellowship, organic compounds, particulate material, natural and engineered aquatic environments, sediments, adsorption, toxic transition metals, trace metal adsorption., Scientific Discipline, Geographic Area, Water, Environmental Chemistry, State, Engineering, Chemistry, & Physics, Environmental Engineering, aquatic, adsorbents, lead, coating composition, analytical chemistry, adsorption mechanism, metal adsorption

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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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