Rudnick, S. M. University of Massachusetts Boston, 7001srudn@umbsky.cc.umb.edu
Chen, R. M. University of Massachusetts Boston, bob.chen@umb.edu
Gardner, G. Bernard. University of Massachusetts Boston, bernie.gardner@umb.edu

 
TIME-RESOLVED, LASER-INDUCED FLUORESCENCE MONITORING AND MODELING OF PYRENE CONCENTRATION AND DISTRIBUTION IN BOSTON HARBOR
 
We have developed a time-resolved, laser-induced fluorescence (TR-LIF) system capable of in situ detection of pyrene, an EPA priority pollutant, at ambient levels in the estuarine environment. We have deployed this instrument on eight cruises in Boston Harbor and have identified specific sources of pyrene. The high spatial and temporal resolution capabilities of the instrument provide an indication of mixing processes affecting pyrene in the Harbor as well as the first detailed spatial study of its distribution in the Harbor. Using our seasonal data, we have developed a fugacity model of pyrene concentration in Boston Harbor seawater that fits well with previous studies of bulk pyrene distribution in the Harbor as well as atmospheric measurements for the Boston area. The model allows water column measurements to be used to estimate vapor-phase pyrene source strengths in the watershed. The rapid deployment and detection characteristics of the TR-LIF system provide a new capability for both long-term monitoring of PAH in estuarine areas and immediate detection and tracking of catastrophic events such as oil spills. Both the capabilities of the system and the application of the measurements to developing models that would enable prediction of contaminant concentrations in seawater will be presented.
 
Day: Wednesday, Feb. 3
Time: 12:15 - 12:30pm
Location: Sweeney Center
 
Code: SS08WE1215S