¹³C NMR and ESR Characterization of Humic Substances Isolated from Soils of Two Siberian Arctic Islands

Table 4

Integral indexes of molecular composition of HAs and FAs.

Plot, horizons, and depths	Aromaticity, %	+ , %	С,H-alkyl/O,N-alkyl
Humic acids
Bolshoy Lyakhovsky, A 0–3 cm	11,4	54,5	1,3
Bolshoy Lyakhovsky, [H], buried	16,3	60,0	1,8
Wrangel Island, A, 0–5 cm	13,7	45,6	0,8
Fulvic acids
Bolshoy Lyakhovsky, A 0–3 cm	4,8	13,3	0,1
Wrangel Island, A, 0–5 cm	4,2	16,5	0,2