In sunlit surface waters, a portion of the solar radiation excites Dissolved Organic Matter (DOM), leading to Photoproduced Reactive Intermediates (PPRIs). Knowledge of reactions between PPRIs and pollutants is vital to understanding the fate of pollutants in surface waters. Water samples from a variety of Minnesota lakes and rivers were characterized using absorbance and fluorescence measurements and the relative amounts of two PPRIs, 1O2 (singlet oxygen) and 3DOM*(excited triple state DOM), were determined using furfuryl alcohol (FFA) and 2,4,6-trimethylphenol (TMP) respectively as probe molecules. We compared two regions in the fluorescence excitation-emission spectra that correspond to predominantly terrestrial (C1) and microbial (C3) DOM. For samples containing predominantly terrestrial DOM, the ratio of C1/C3 is higher than for primarily microbial samples. We have also observed that DOM that is primarily microbial has relatively higher yields of 3DOM* and 1O2 compared to terrestrial DOM.

Photoproduced reactive intermediates in surface waters: Investigation of factors that determine which reactive intermediates are produced

248th National Meeting (2014)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.