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Hydrogen peroxide (H 2 O 2 ) has been observed in significant concentrations in many natural waters. Because hydrogen peroxide can act as an oxidant and reductant, it participates in an extensive suite of reactions in surface waters. Hydrogen peroxide is produced as a secondary photochemical product of chromophoric dissolved organic matter (CDOM) photolysis. Apparent quantum yields...
Chromophoric dissolved organic matter (CDOM) was collected and concentrated using 1 kDa cutoff tangential flow filtration (TFF) from marine (~33 salinity), mid-estuarine (~15 salinity), and freshwater (<1 salinity) portions of the Chesapeake and San Francisco Bays. Natural bacterioplankton were also collected during the same transects on 0.22-μm pore size filters. TFF permeates from freshwater,...
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