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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