Expert Environmental Chemist: Aqueous - Phase Photochemistry, Sunscreen (1438)
Expertise
Aqueous-phase photochemistry.
Measurement of quantum yields for formation of free radical oxidants (OH and O2), and single molecular oxygen (O2) in illuminated solutions using spectroscopic and kinetic techniques.
Measurement of kinetic rate constants for reactions of free radical oxidants and O2 with chemical compounds of biological importance.
Formation and biological impacts of photochemically generated free radicals formed in vivo.
Sunscreens, ophthalmic drugs, and antibiotics.
Measurement of thermodynamic Henry's law constants (H) for partitioning of chemical species of environmental interest between air and water.
Equilibrium partitioning between phases and the role of chemical compound transport in the environment.
An improved method for determination of H values with optical absorbency of a solute in aqueous solution as it partitions to the vapor phase in a sealed vessel combined with a variety of organic compounds.
Experience
Associate Professor, Department of Chemistry, Undisclosed University, 1996 - Present
Teach undergraduate and graduate courses in chemistry.
Set up a research laboratory and conducted research in environmental analytical chemistry.
Adjunct Instructor, Department of Chemistry, Undisclosed University, 2004 - 2006
Taught freshman chemistry courses during summer sessions.
Adjunct Instructor, 1996-1997
Indiana University-Purdue University at Indianapolis, School of Public and Environmental Affairs.
Taught a graduate level course in environmental chemistry.
Research Assistant, Environmental Chemistry Laboratory, Duke University, 1987-1991
Measured the formation and steady-state concentrations of photochemically produced oxidant species such as hydroxyl radical (OH) and other oxygen centered radicals as well as singlet molecular oxygen (O2) and hydrogen peroxide in illuminated cloud and fog samples.
Measured kinetic rate constants for reactions of oxidants and organic compounds in aqueous solutions.
Teaching Assistant, Duke University, 1987 - 1991
Assisted in the instruction of graduate students in environmental chemistry and fate of organic chemicals courses.
Instructed senior chemistry undergraduate students in instrumental methods of laboratory analysis.
Analytical Chemist, Research Triangle Institute, North Carolina, 1985 - 1987
Responsible for management of a contract with the USEPA that involved the development of a repository of compressed gas cylinders that were used as analytical standards for testing the ability of hazardous waste incinerator facilities to monitor emissions.
Developed automated cryogenic trapping method for gas chromatographic analysis of organics in air.
Honors & Publications
Photostabilities of Sunscreen Active Ingredients
Photochemistry of Several New Sunscreen Active Ingredients
Direct Detection of Singlet Molecular Oxygen in Photobiological Systems,
Remediation of Power Plant Effluent Water Contaminated with Selenium and Cyanide
Development of a Chemical Actinometer for Pharmaceutical Photostability Studies
HP-5880A Gas Chromatograph Enhancement
Photostability of Several Structurally Related Chemical Compounds Having Potential
Application as New Sunscreen Active Ingredients
Aqueous-Phase Photochemistry of Atmospheric Hydrocarbon Oxidation Products
Education
Ph.D., Environmental Chemistry, Duke University , Dissertation Title: Aqueous-Phase Photochemical Production of Oxidants in Atmospheric Waters
M.S., Analytical Chemistry, Virginia Commonwealth University, Thesis Title: Capillary Gas Chromatographic Analysis of Fischer - Tropsch Liquid Products
B.S., Chemistry, Virginia Commonwealth University