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Table 3 Distribution of H intensity of the 1 H NMR spectra of the humic fractions

From: Chemical and spectroscopic characterization of insoluble and soluble humic acid fractions at different pH values

Fraction   1H NMR distribution (%)
0.5 to 3.0 ppm 3.0 to 4.2 ppm 6.0 to 8.0 ppm
pH 5 Insoluble 45.6 36.7 17.7
Soluble 45.2 23.2 31.6
pH 7 Insoluble 47.6 40.3 12.1
Soluble 46.9 20.5 32.6