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Chemical and Biological Technologies in Agriculture

Table 1 Elemental, carboxylic, and phenolic group composition of HA

From: Exploring the synergistic effects of goethite intercalated coal in the presence of humic acids for enhanced growth of Sinapis alba

Elemental content on ash and moisture-free basis, %

Ash, %

Atomic ratios

Carboxylic and phenolic group content, mmol g−1

C

H

N

O

 

H/C

O/C

COOH

Phenolic OH

Total acidity

62.2

4.4

0.85

32.12

6.12

0.85

0.39

4.6

1.3

5.9

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