Grantee Research Project Results
Photolytic Impact on Dissolved Organic Matter: Implications for Copper-Organic Binding and Toxicity in Natural WatersEPA Grant Number: U915640
Title: Photolytic Impact on Dissolved Organic Matter: Implications for Copper-Organic Binding and Toxicity in Natural Waters
Investigators: Lovvorn, Marjorie B.
Institution: University of Wyoming
EPA Project Officer: Fields, Nigel
Project Period: January 1, 1999 through January 1, 2002
Project Amount: $75,872
RFA: STAR Graduate Fellowships (1999)
Research Category: Fellowship - Toxicology , Health Effects , Academic Fellowships
The objective of this research project is to clarify the role of photochemical and microbial degradation of dissolved organic matter (DOM) in altering the toxicity of copper (Cu) in natural waters.Approach:
A series of experiments will be conducted that are designed to investigate changes in the physicochemical, spectral, and Cu-organic binding characteristics of natural DOM before and after controlled photodegradation under a full-spectrum solar simulator (Suntest CPS+).
This research will be the first to consider how the ongoing degradation of natural DOM alters its relative binding affinities for Cu and thus, Cu bioavailability to fish. Experimental results should support proof of the principal that photochemical breakdown of DOM alters Cu toxicity and is essential to environmentally relevant estimates of Cu-organic binding in natural waters.Supplemental Keywords:
fellowship, bioavailability, copper, dissolved organic matter, DOM, photochemical.