Aquatic Toxicity Testing for the Development of a Mixed Metal Biotic Ligand Model
JF Ranville (PI), Copper Development Corporation, June 2009-December 2009.
Toxicity testing of mixtures of metals (Cu, Zn, Ag, Cd) is being performed using D. magna. Results are being investigated to determine if the affects are: synergistic, additive, or antagonistic. Results will be used to more fully parameterize the biotic ligand model, a computational approach to assessing aquatic toxicity of cationic metals.
Evaluation of Constructed Wetlands for the Removal of Metals from AMD
JF Ranville (PI), US Environmental Protection Agency (USEPA), Region VIII, March 2009-December 2009.
The removal of metals from a constructed wetland that receives both acid mine drainage and treated municipal wastewater is being investigated. Mechanisms being examined include: phyto-uptake, sorption to metal oxides, and precipitation. Ecotoxicological endpoints that are under investigation include: bioaccumulation, feeding rate, and mortality.
A Novel Sensor for the In Situ Measurement of Uranium Fluxes
JF Ranville (PI), Department of Energy, Environmental Remediation Sciences Program (DOE-ERSP) (Subcontractor to University of Florida), May 2008-April 2011
The project goal was to develop a sensor for measuring uranium flux in groundwater. The application is for the risk assessment of the Rifle, Colorado DOE study site.
Assessment and Treatment of the Young-Dong Coal Mine
JF Ranville (PI), MIRECO, May 2008-December 2008
In this project the environmental impact of a coal mine in South Korea was assessed. As part of the project a design for a passive treatment system was prepared.
Development of a Guidance Document for Estimating Dermal Absorption from Contaminated Soils
AL Bunge (PI), Environmental Protection Agency (EPA), April 2008-January 2009
A guidance document was written describing how to estimate dermal absorption from contaminated soils, based upon the current knowledge and new research results produced at CSM.
In Situ Examination of Hydrogen Peroxide Sources and Sinks in a Slightly Alkaline Stream
B Voelker (PI at CSM), National Science Foundation (NSF) Collaborative Research, September 2007-August 2010
Hydrogen peroxide may be the most important source of hydroxyl radical in surface waters via Fenton's reaction - reduction of hydrogen peroxide by Fe(II). Oxidation by hydroxyl radical is an effective mechanism for converting refractory organic compounds, including contaminants and natural organic matter, to CO2 and microbial substrates. The overall goal of the proposed work was to conduct the first comprehensive study of hydrogen peroxide cycling in a natural stream. Our results will show whether hydroxyl radical production from hydrogen peroxide could be a dominant mechanism of indirect photolysis of organic contaminants and natural organic matter in streams. Our work could also lay the groundwork for developing methods to accelerate Fenton's reaction in systems such as agricultural headwaters, for the purpose of decreasing concentrations of contaminants such as atrazine.
Molecular Modeling of Self-Assembling Human Skin Lipids
AL Bunge (co-PI and PI at CSM) with C McCabe (PI, University of Vanderbilt), National Institute of Arthritis, Musculoskeletal and Skin Diseases (NIAMS), August 2007-July 2010
The ultimate goal was to develop a basic understanding of how and why skin lipids assemble into specific structures and how this affects skin barrier function. The approach was to simulate lipids in the stratum corneum, which consist mainly of ceramides, cholesterol and fatty acids.
Relating Pore-Scale Uranium (VI) Aquatic Speciation to Intermediate-Scale Aquifer Heterogeneity: Determining pH-Dependant Uranium-Nanoparticle Partitioning in Small-Volume Porewater Samples
JF Ranville (PI), Department of Energy, Environmental Remediation Sciences Program (DOE-ERSP), June 2007-May 2010
The project was to develop Field flow fractionation-ICP-MS methods to determine the in-situ speciation of uranium in groundwater. This is part of a larger risk-assessment project for contaminated groundwaters at Rifle, Colorado.
Nanoparticle Stability in Natural Waters and Its Implication for Metal Toxicity to Water Column and Benthic Organisms
JF Ranville (PI), US Environmental Protection Agency, Science to Achieve Results (USEPA-STAR), April 2007-April 2010.
The aquatic toxicity of quantum dots was examined. The stability of quantum dots in natural waters and the development of detection techniques for nanoparticles at low concentration were also investigated.
Critical Evaluation of Hydrodynamic and Geochemical Parameters Affecting Contaminant Migration
JF Ranville (PI), Battelle Memorial Institute, January 2007-February 2009
The ecological risk of pharmaceuticals applied to soil was assessed by examining the adsorption of the target compounds to soil particles.
Superoxide Radical Reactions in the Ocean
B Voelker (PI), National Science Foundation, February 2006-January 2009
The goal of this research effort was to provide occupational safety and health practitioners with improved guidance regarding potentially dangerous levels of occupational dermal exposure.