Fig. 1: Three-dimensional excitation–emission matrix fluorescence (3D-EEM) spectra of waste milk (WM) treated by KOH/persulfate (KOH/PS) under different conditions.
From: Waste milk humification product can be used as a slow release nano-fertilizer
EEM spectra variation of waste milk treated by 4 g KOH/4 g PS at 0 min (a), 10 min (b), 20 min (c), 30 min (d), 45 min (e), 60 min (f), 90 min (g), and 120 min (h). EEM spectra of treated waste milk by 4 g PS (i), 4 g KOH (j), 2 g PS/4 g KOH (k), 4 g PS/2 g KOH (l), 4 g PS/4 g KOH (m), 4 g PS/6 g KOH (n), 6 g PS/4 g KOH (o) and 6 g PS/6 g KOH (p). Experimental conditions: waste milk volume = 50 mL, persulfate potassium (KOH) dosage = 0–6 g, ambient temperature = 22 ± 1°C, and reaction time = 0–2 h. Each experiment was performed three times independently with similar results. Source data are provided as a Source data file.
