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NEW APPROACHES TO ESTIMATING INDIRECT PHOTOLYSIS RATES IN AQUATIC ENVIRONMENTS
Citation:
Zepp, R G. NEW APPROACHES TO ESTIMATING INDIRECT PHOTOLYSIS RATES IN AQUATIC ENVIRONMENTS. Presented at 20th Annual Society of Environmental Toxicology and Chemistry Meeting, Philadelphia, PA, November 14-18, 1999.
Description:
Indirect photoreactions in aquatic environments are driven by reactive species, most of which are oxygen centered. Humic substances play an important role in photosensitizing the production of these reactive species, which include singlet molecular oxygen, superoxide ions, hydrogen peroxide, OH radicals and hydrated electrons. In addition, it has been demonstrated recently that photoreactions of humic substances alter their bioavailability, thus influencing microbial activity in surface waters. This paper selectively reviews recent research relevant to estimating indirect photoreactions and will briefly describe the possible role of photochemical-microbial interactions in the fate and transport of compounds in freshwater and marine environments.