FTIR photoacoustic spectroscopy for identification and assessment of soil components: Chernozems and their size fractions.

ABSTRACT: FTIR photoacoustic spectroscopy was used to approach inorganic matrix components and organic-matter constituents of chernozem size fractions (1-5000??m, by dry sieving) with a different history of use (from intact steppe to permanent bare fallow, a continuous long-term field experiment). The conditions of FTIR photoacoustic measurements in continuous-scan modes were compared with attenuated total reflection measurements, the advantages of photoacoustic measurements resulting from a higher intensity of the incident radiation and signal-generating volume were discussed. Overtone peaks of quartz as a soil matrix component at 2000-1700 cm-1 were selected as a possible internal-standard (guide) bands for the comparison of photoacoustic spectra. For different land-use samples, differences in the composition were found, which are differently manifested in normalized spectra of size fractions, with millimeter-size, 20-100??m, and silt fraction bearing the maximum information.

SUBMITTER: Krivoshein PK 

PROVIDER: S-EPMC7292858 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature