Vd. Tikhova et al., Specific features of humic acids from various soils as studied by thermal analysis and C-13 NMR, RUS J AP CH, 71(7), 1998, pp. 1229-1233
Humic acids of tundra soils are characterized by elemental analysis, therma
l analysis, and IR and C-13 NMR spectra. The specific features of these aci
ds as compared to those of steppe soils are found.