Predicting Reactive Intermediate Quantum Yields from Dissolved Organic Matter Photolysis Using Optical Properties and Antioxidant Capacity.

The antioxidant capacity and formation of photochemically produced reactive intermediates (RI) was studied for water samples collected from the Florida Everglades with different spatial (marsh versus estuarine) and temporal (wet versus dry season) characteristics. Measured RI included triplet excited states of dissolved organic matter (DOM*), singlet oxygen (O), and the hydroxyl radical (OH). Single and multiple linear regression modeling were performed using a broad range of extrinsic (to predict RI formation rates, R) and intrinsic (to predict RI quantum yields, Φ) parameters.