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