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Table 1 Chemical properties of humic acids

From: Potential alteration of iron–humate complexes by plant root exudates and microbial siderophores

Sample C (%) H (%) N (%) Ash (%) Acidity (meq g−1) Complexed Fe (%)
Total Carboxyl Phenolic
HA1 50.8 4.2 2.3 1.0 10.7 4.7 6.0 7.57
HA2 64.2 3.5 1.5 1.5 9.3 4.4 4.9 6.83