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hydroxyl radical concentration.21 In a typical procedure, to aqueous suspensions of ZnO (0.1 g/L), 2 mM of TA was added and stirred
under ambient light. At regular intervals, 3 mL aliquots were withdrawn and filtered through a membrane filter and fluorescence
was measured at excitation wavelength of 312 nm. The intensity of emission at 425 nm is correlated to the hydroxyl radical concentration.
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