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Irradiation of aqueous solutions containing the sodium salt of sulfonated poly(ether etherketone) and HCO2H/HCO2− buffers with 350 nm photons induced photoreduction of CCl3F to CHCl2F and Cl−. In situ determinations of chloride ion concentrations enabled evaluation of the quantum yield, ϕ(Cl−), which amounted to 0.46 in air-free, neutral solutions. A delayed formation of F− was noticed with a quantum...