Radicals of •OH and SO4• generated during the humification process were measured, with 5,5-Dimethyl-1-pyrroline-N-oxide (DMPO) as the spin-trapping agent, using an electron paramagnetic resonance spectrometer (EPR spectrometer). To determine the contributions of each radical, quenching tests were conducted by adding 10 mol/L TBA or EtOH to wasted milk before dosing PS and KOH.
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