Callahan, J. University of Massachusetts, Boston, jcal@alum.mit.edu
Chen, R. University of Massachusetts, Boston, chenr@umbsky.cc.umb.edu

 
CHARACTERIZATION OF DISSOLVED ORGANIC MATTER IN SURFACE WATERS OF BOSTON HARBOR AND CHESAPEAKE BAY
 
The reactivity and nature of dissolved organic matter (DOM) in natural systems cannot be predicted by simply measuring total dissolved organic carbon. Further molecular characterization is needed to observe changes in the reactivity of DOM from terrestrial to marine systems. In an attempt to further characterize DOM in seawater, thirteen pre-filtered large volume samples (100-200L) were collected at a variety of salinities and contamination levels in and around Boston Harbor and the Chesapeake Bay. High molecular weight(HMW) DOM was isolated using an Amicon DC10L (1000 Dalton mw cutoff). The samples were desalted via diafiltration prior to final collection. Freeze-dried samples are analyzed by direct temperature mass spectrometry (DTMS) using a Finnigan direct coupled induction (DCI) probe and quadrupole mass spectrometer. With this technique it is possible to acquire semi-quantitative information from small amounts of sample in a relatively short amount of time (minutes). Initial results from Boston Harbor and Chesapeake Bay will be discussed.
 
Day: Tuesday, Feb. 2
Time: 11:00 - 11:15am
Location: Eldorado Hotel
 
Code: CS56TU1100E