The photochemistry of natural waters is greatly impacted by the absorption of light by and the photochemical reactions of Chromophoric Dissolved Organic Matter (CDOM). In order to understand the species involved in these processes and their effect on the optical properties of CDOM, as well as their variance based on source, it is necessary to investigate the composition of CDOM by various functional groups and their effect on the photochemical and optical properties of CDOM. This study investigates the contribution of quinones to CDOM optical properties from various sources through model quinone and CDOM reduction using dithionite, borohydride, and sulfite. Model quinone studies provide insight into reaction products and mechanisms. Current results on dithionite and sulfite-reduced methyl-substituted quinones show that the reactivity of the quinone depends on degree and pattern of substitution. Ongoing studies investigate reaction stoichiometries, products, and mechanisms. The change in optical properties of model quinones with reduction will be compared to the changes in CDOM optical properties with reduction, giving deeper insight into the contribution of quinones to the optical properties of CDOM and its dependence on source.

Examining quinone reactivity in chromophoric dissolved organic matter (CDOM) through reactions of quinones with sodium dithionite and sodium sulfite

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