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(a) Effect of humic acid concentration on the degradation of NOR by the MW/UV process and (b) Effects of different surfactants on the degradation of NOR by the MW/UV process. (Experimental conditions: microwave power = 500 W, UV light intensity = 31.8 mW/cm2, maximum wavelength = 254 nm, [NOR] = 5 mg/L, and [surfactant]: 5 mg/L).
