Table 1 Structural characteristics of the leonardite HA used in this study.

From: Label Distribution in Tissues of Wheat Seedlings Cultivated with Tritium-Labeled Leonardite Humic Acid

Elemental composition

MW, kD

Acidic groups, mg-eqv g−1

Carbon content in the structural fragments, %

H/C

O/C

C/N

 

COOH

PhOH

CC=O

CCOO

∑CAr

∑CAlk

0.87

0.50

53

9.9

4.2

1.1

4.4

14.1

52.5

28.9

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