Table 2 Relative carbon distribution (%) in different regions of chemical shift (ppm) in 13C-CPMAS-NMR spectra of humic samples
From: Potential alteration of iron–humate complexes by plant root exudates and microbial siderophores
Sample | Aliphatic C (0–105 ppm) | Aromatic C (105–165 ppm) | Carboxyl C (165–190 ppm) |
|---|---|---|---|
HA1 | 78.1 | 16.0 | 10.2 |
HA2 | 51.7 | 39.4 | 16.6 |