Photoproduction Rates of One-Electron Reductants by Chromophoric Dissolved Organic Matter via Fluorescence Spectroscopy: Comparison with Superoxide and Hydrogen Peroxide Rates

One-electron reductants (OER) photoproduced by chromophoric dissolved organic matter (CDOM) have been shown to be likely precursors for the formation of superoxide and subsequently hydrogen peroxide. An improved method that employs a nitroxide radical probe (3AP) has been developed and utilized to determine the photoproduction rates of OER from a diverse set of CDOM samples. 3AP reacts with OER to produce the hydroxylamine, which is then derivatized with fluorescamine and quantified spectrofluorometrically. Although less sensitive than traditional methods for measuring RO2 center dot-, measuring RH provides a simpler and faster method of estimating RO2 center dot- and is amenable to continuous measurement via flow injection analysis. Production rates of OER (R-H), superoxide (RO2 center dot-), and hydrogen peroxide (R-H2O2) have a similar wavelength dependence, indicating a common origin. If all the OER react with molecular oxygen to produce superoxide, then the simplest mechanism predicts that R-H/R-H2O2 and RO2 center dot-/RH(2)O2 should be equal to 2. However, our measurements reveal R-H/R-H2O2 values as high as 16 (5.7-16), consistent with prior results, and RO2 center dot-/RH2O2 values as high as 8 (5.4-8.2). These results indicate that a substantial fraction of superoxide (65-88%) is not undergoing dismutation. A reasonable oxidative sink for superoxide is reaction with photoproduced phenoxy radicals within CDOM.

Automated summary

Research has shown that OER photoproduced by CDOM may be precursors for superoxide and hydrogen peroxide formation. An improved method utilizing 3AP probe has been developed to accurately measure OER photoproduction rates from different CDOM samples. Results indicate that the oxidative sink for superoxide may involve reaction with photoproduced phenoxy radicals within CDOM.