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Fig. 3. Cross-polarization–total sideband suppression (CP/TOSS) ¹³C nuclear magnetic resonance spectra of humic acids (HAs) isolated in 0.1 M NaOH at pH 12, and in 0.1 M NaOH + 6 M urea after prior exhaustive extractions at pH 7 and at 10.6. CON = amide, COO = carboxyl, Arom-C = aromatic carbon; OC = oxygen alkyl carbon; alipha. = aliphatic carbon.