Cooperative Institute for Research in Environmental Sciences

Analytical Chemistry Seminar: Zachary Finewax and Randall Chiu

Analytical Chemistry Seminar: Zachary Finewax and Randall Chiu

Ozonolysis of a polyunsaturated acid and its primary oxidation products

Zachary Finewax - 1st Year Graduate Student, Department of Chemistry and Biochemistry

Detection of glyoxal, the smallest α-dicarbonyl, in remote locations over the Pacific Ocean, has prompted research into its sources. Glyoxal is likely produced by oxidation of compounds within the sea surface microlayer. Reactions of linoleic acid, a polyunsaturated fatty acid found in the sea surface microlayer, and its primary gas phase oxidation products yielded glyoxal without an OH scavenger present. In the presence of an OH scavenger, glyoxal production is significantly reduced, and malondialdehyde, the smallest β-dicarbonyl, was detected. These findings elude to a mechanism of glyoxal formation, and a possible explanation of why malondialdehyde has not been detected in the atmosphere.

Pond Scum and Boiling Water: Water Chemistry at Yellowstone National Park

Randall Chiu - 1st Year Graduate Student, Department of Chemistry and Biochemistry

Since the mid-1990's, the Nordstrom lab at the US Geological Survey National Research Program (USGS NRP) has sampled numerous hot springs and rivers in Yellowstone National Park (YNP). The data, collected at least annually, provide a unique record of the inorganic chemistry (including major cations and anions, trace metals, and unusual species such as polythionates) of the geothermal waters at YNP. The data are used by collaborators at various universities to supplement microbiology research and also by USGS researchers investigating the geochemistry of YNP. This talk will summarize some of the current research efforts at YNP, with emphasis on USGS work that has public health and safety implications.

Jointly sponsored by the Department of Chemistry and Biochemistry, CIRES, and the Environmental Program

location

CIRES Fellows Room, Ekeley S274 - 1665 Central Campus Mall, Boulder, CO 80309