A comparative analysis of humic acids from Khakassia paleosols using ir-expert computer program

• Main Authors: V. D. Tikhova, T. F. Bogdanova, M. I. Dergacheva, V. P. Fadeeva, E. V. Kallas
• Format: Dataset
• Language: Russian
• Published: Theoretical and Applied Ecology 2015
• Subjects: IR spectroscopy; humic acids; paleosols; IR databases; Tundra
• Online Access: https://dx.doi.org/10.25750/1995-4301-2015-1-024-027; http://envjournal.ru/ari/v2015/v1/files/15105.pdf

The objectives of this work are to reveal and to compare large-scale IR characteristic blocks, which are hypothetically constituents of humic acids (HA) macromolecules of different age. It is based on computer-assisted assay of fragmental composition of organic compounds, which IR spectra are the most similar to those of the HA samples. A new approach is suggested to identification of IR absorption bands with IR Expert computer program designed to obtain additional information about the structure of HA with no spending and no destructing of the sample. Humic acids were isolated from five loam soils of lake basins in the Chulym-Yenisei valley located in steppe zone of Khakassia, and dated at between 850 and 3500 years (by the 14C method). Analysis of compounds’ structures on post-retrieval step has revealed a presence of nitrogen heterocyclic structures, chains of conjugated olefinic linkages, and phosphate monoesters. Absence of pteridine backbone in paleosol HA that previously found in HA from peat and tundra soils is noted. Accumulation of comparative data about HA of different origin and age is to contribute revealing structural changes in HA both depending on conditions of formation and in time.