Table 3: Percentage of carbon in the main structural fragments of HAs and FAs (according to 13С NMR).

Plot, horizons, and depthsChemical shifts, ppm
0–4747–6060–110110–144144–164164–183183–190

Humic acids
Bolshoy Lyakhovsky, A 0–3 cm44,512,021,210,01,210,90,2
Bolshoy Lyakhovsky [H], buried49,79,417,510,35,87,10,2
Wrangel Island, A, 0–5 cm33,816,524,811,81,411,20,5

Fulvic acids
Bolshoy Lyakhovsky, A 0–3 cm9,76,369,33,61,19,90,1
Wrangel Island, A, 0–5 cm12,97,265,33,60,510,40,1