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

Table 3

Percentage of carbon in the main structural fragments of HAs and FAs (according to ¹³С NMR).

Plot, horizons, and depths	Chemical shifts, ppm
	0–47	47–60	60–110	110–144	144–164	164–183	183–190
Humic acids
Bolshoy Lyakhovsky, A 0–3 cm	44,5	12,0	21,2	10,0	1,2	10,9	0,2
Bolshoy Lyakhovsky [H], buried	49,7	9,4	17,5	10,3	5,8	7,1	0,2
Wrangel Island, A, 0–5 cm	33,8	16,5	24,8	11,8	1,4	11,2	0,5
Fulvic acids
Bolshoy Lyakhovsky, A 0–3 cm	9,7	6,3	69,3	3,6	1,1	9,9	0,1
Wrangel Island, A, 0–5 cm	12,9	7,2	65,3	3,6	0,5	10,4	0,1