Source, Distribution, and Structure of DOM

45 pm) in seawater are low, at around 80 pmoll in surface waters and 40 pmol 1 in deep waters [60]. Methods for collection, extraction, isolation, and analysis of samples have been reviewed [61-63]. 

5 kDa [71,72]. Preliminary studies in our laboratory on marine samples from South Florida waters also indicate molecular weight values in the low kDa range for coastal marine DOM (Fig. 4). 

Couphng FFFF or Hquid chromatography as the separation technique, with structural characterization by LC/MS°, is a promising route to elucidating the behavior of DOM in marine systems. This approach may well allow the examination of the optical properties of CDOM on a molecmlar level by correlating the structural and optical features of sized fractions. 

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