Fig. 2: Structural characterization of waste milk humification product.
From: Waste milk humification product can be used as a slow release nano-fertilizer
A Fourier transform infrared spectrometer (FTIR) spectra of standard fulvic acid (FA) and treated waste milk (WM) at different intervals (0, 2, 5, 15, 30, and 60 min). B Solid-state 13C nuclear magnetic resonance (13C-NMR) spectra of waste milk, product and standard FA. C, D X-ray photoelectron spectroscopy (XPS) spectra of C1s for waste milk and product. Humification conditions: [persulfate potassium]0 = 80 g/L, [KOH]0 = 80 g/L, ambient temperature=22 ± 1 oC, reaction time = 1 h. Each experiment was performed three times independently with similar results. Source data are provided as a Source Data file.
