Gao, H. and R.G. Zepp. 1998. Factors influencing photoreactions of dissolved organic matter in a coastal river of the southeastern United States. Environmental Science and Technology, 32:2940-2946.
    	Photoreactions of dissolved organic matter can affect the oxidizing
    capacity, nutrient dynamics, trace gas exchange and color of surface waters. 
    This study focuses on factors that affect the photoreactions of the colored
    dissolved organic matter (CDOM) in the Satilla River, a coastal river that
    has high concentrations of dissolved organic carbon (DOC) (2.0 ± 0.2 mM C) 
    and iron (12 ±µM) in its freshwater reach.  Quantum yields for the photoproduction 
    of dissolved inorganic carbon (DIC) and carbon monoxide (CO) from Satilla CDOM 
    decreased exponentially in the 300 - 450 nm spectral region.  Photoreaction of 
    the CDOM in sunlight caused a decrease in UV and visible absorbance that occurred
    most rapidly in the UV-B (280 - 315 nm) region, indicating that CDOM photoreactions
    can enhance exposure of aquatic organisms to DNA-damaging UV radiation.  The 
    role of iron in the photooxidation was investigated by adding fluoride ions or 
    deferoxamine mesylate (DFOM) to the water to form unreactive Fe3+ complexes,
    thus inhibiting iron photoreduction and slowing CDOM photooxidation.  Using
    this method, it was demonstrated that the photoformation of DIC, CO, and
    NH4+ is strongly affected by iron catalysis in the Satilla River water.  Increasing the dioxygen 
    content and lowering the pH accelerated the photoreaction of the CDOM.  CDOM 
    photoreaction was accompanied by conversion of dissolved iron and carbon to 
    particulate forms.  Such "photocoagulation" may contribute to the transport of 
    iron and carbon from surface waters to sediments in sunlit, well-stratified
    aquatic ecosystems.