SciELO - Scientific Electronic Library Online

 
vol.42 issue1Development and optimization of a multiresidue method for pesticide analysis in honey bee using Simplex methodIn situ synthesis of silver nanoparticles on fique fibers author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

  • On index processCited by Google
  • Have no similar articlesSimilars in SciELO
  • On index processSimilars in Google

Share


Revista Colombiana de Química

Print version ISSN 0120-2804

Abstract

MARTINEZ, Claudia X.; BRAVO, Isabel  and  MARTIN, Francisco J.. Molecular composition of humic acids evaluated by pyrolysis - gas chromatography - mass spectrometry and thermally assisted hydrolysis and methylation in high Colombian Andean soils. Rev.Colomb.Quim. [online]. 2013, vol.42, n.1, pp.31-46. ISSN 0120-2804.

It was determined the molecular composition of humic acids (HA) extracted from 'A' horizon in Colombian high Andean soils dedicated to three uses: primary forest, croplands and pastures. The AH were obtained by sequential extraction of humified organic matter (HOM) with tetraborate, pyrophosphate and sodium hydroxide (0.1N) solutions; HA were purified through various analytical processes. Its chemical composition was determined by Py-GC/MS and THMA. Different pyrolysis products were classified in response to the chemical family to which they belong, prevailed fatty acids (FA) as the most abundant in all AH, while phenols, sterols, terpenes and S-compounds were found in lower abundance. There were differences in the percentages of relative abundance of the identified groups, showing that the land use change influences the physical, chemical, and biological propertiers of soils that are perceived at different levels of transformation, affecting the HA composition and its reactivity in the soil.

Keywords : humic acids; High Andes soils; pyrolysis - gas chromatography - mass spectrometry; thermally assisted hydrolysis; methylation.

        · abstract in Spanish | Portuguese     · text in Spanish     · Spanish ( pdf )