Physical Sciences and Mathematics Commons^™

Environmentally Persistent Free Radicals (Epfrs). 3. Free Versus Bound Hydroxyl Radicals In Epfr Aqueous Solutions, Lavrent Khachatryan, Cheri A. Mcferrin, Randall W. Hall, Barry Dellinger

Collected Faculty and Staff Scholarship

Additional experimental evidence is presented for in vitro generation of hydroxyl radicals because of redox cycling of environmentally persistent free radicals (EPFRs) produced after adsorption of 2-monochlorophenol at 230 °C (2-MCP-230) on copper oxide supported by silica, 5% Cu(II)O/silica (3.9% Cu). A chemical spin trapping agent, 5,5-dimethyl-1-pyrroline-N-oxide (DMPO), in conjunction with electron paramagnetic resonance (EPR) spectroscopy was employed. Experiments in spiked O¹⁷ water have shown that ∼15% of hydroxyl radicals formed as a result of redox cycling. This amount of hydroxyl radicals arises from an exogenous Fenton reaction and may stay either partially trapped on the surface …