Finding Fluorine: Photoproduct Formation during the Photolysis of Fluorinated Pesticides.

ABSTRACT: The photolysis of pesticides with different fluorine motifs was evaluated to quantify the formation of fluorinated products in buffered aqueous systems, advanced oxidation (AOP) and reduction processes (ARP), and river water. Simulated sunlight quantum yields at pH 7 were 0.0033, 0.0025, 0.0015, and 0.00012 for penoxsulam, florasulam, sulfoxaflor, and fluroxypyr, respectively. The bimolecular rate constants with hydroxyl radicals were 2 to 5.7 × 10¹⁰ M^-1 s^-1 and, with sulfate radicals, 1.6 to 2.6 × 10⁸ M^-1 s^-1 for penoxsulam, florasulam, and fluroxypyr, respectively. The rate constants of sulfoxaflor were 100-fold lower. Using quantitative ¹⁹F-NMR, complete fluorine mass balances were obtained. The maximum fluorid

SUBMITTER: Bhat AP 

PROVIDER: S-EPMC9454825 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature