Analytical characterization of humic substances in soil


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PDF Spectroscopic characterization of humic and fulvic acids in

The aim of this study was to characterize humic and fulvic acids using infrared spectroscopy and nuclear magnetic resonance (NMR) in aggregates collected from areas under different crop and soil management systems Soil samples were collected at depths of 0 00–0 10

  • Are humic and fulvic acid fractions linked to organic matter left on soil?

    The results obtained showed that the structural characterization of the humic and fulvic acid fractions were linked to organic matter left on the soil surface, especially where the agricultural system involved species diversity.

  • Do humic acids retain carbon in soil?

    In fulvic acids extracted from aggregates <2 mm, and humic acids extracted from aggregates < and ≥2 mm, the carbon is retained in the soil, even under the effects of waste decomposition in more intense management systems and the presence of biological activity.

  • How many humic substances are in organic matter?

    In chemical terms, organic matter consists of three fractions of humic substances (HS): humin, fulvic acids and humic acids ( Santos and Camargo, 1999 ).

  • Are humic acid fractions correlated with crop rotation and harrowing?

    In the humic acid fractions (HAF) of aggregates ≥2 mm ( Figure 1) under no-till with crop rotation and fulvic acid fractions (FAF) in the no-till chiseled there was a greater intensity, and under disk harrowing with succession a lower intensity of peaks in FAF, which could be correlated with the management systems and cropping in the area.

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    The application of non-destructive analytical methods such as UV-VIS, FTIR, 13C NMR, and fluorescence spectroscopy help us to provide main characteristics of selected humic substances Humic substances (HS) are present in many natural materials, such as soil, water, peat, compost, and brown and brown-black coal
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    composition analysis of humic acids confirmed the data found for fulvic acids, AND STRUCTURAL CHARACTERIZATION OF SOIL HUMIC SUBSTANCES
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