Differential thermal analysis of sedimentary humic acids in the light of their origin

Gonet, S. S.; Cieślewicz, Joanna

doi:10.1016/s0160-4120(98)00035-x

Cited by 11 publications

(10 citation statements)

References 5 publications

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“…The information from thermogravimetry, giving a negative correlation between O/N content and 1st TGA onset temperature, also confirmed that humic acid regeneration reduced the thermal stability of the materials (Gonet and Cieslewicz 1998). Generally, the more H was present in the humic sample, the lower the amount of ash produced in the thermogravimetric analysis became.…”

Section: Resultssupporting

confidence: 52%

The physico-chemical properties and biostimulative activities of humic substances regenerated from lignite

et al. 2014

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The positive effect of humic acids on the growth of plant roots is well known, however, the mechanisms and role of their physical structure in these processes have not been fully explained yet. In this work, South-Moravian lignite was oxidized by means of nitric acid and hydrogen peroxide to produce a set of regenerated humic acids. The elemental composition, solid state stability and solution characteristics were determined and correlated in vitro with their biological activity. A modified hydroponic method was applied to determine the effects of their potassium salts on Zea mays seedlings roots with respect to the plant weight, root length, root division, and starch and protein content. The relations between the determined parameters were evaluated through Principal Component Analysis and Pearson’s correlation coefficients. The results indicated that the most important factor determining the biological activity of South-Moravian lignite potassium humates is related to the nature of self-assemblies, while the chemical composition had no direct connection with the root growth of Zea mays seedlings. It was demonstrated a controlled processing that provided humic substances with different chemical and physicochemical properties and variable biological activity.

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Section: Resultssupporting

confidence: 52%

The physico-chemical properties and biostimulative activities of humic substances regenerated from lignite

et al. 2014

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“…Soler-Rovira et al [2] reported negative correlations between the H/C ratio and the Cu complexion capacity of humic substances due to the greater contribution of aromatic functional groups for the adsorption of Cu compared to aliphatic. Other authors found negative correlations between the H/C and N/C ratios of humic substances with thermal stability [26,27], showing a higher degree of stability of HS and PB and a lower one for M, which agreed with the results obtained from the DSC analysis of these amendments (Section 3.1.4).…”

Section: Elemental Analysissupporting

confidence: 84%

Evaluation of Commercial Humic Substances and Other Organic Amendments for the Immobilization of Copper Through 13C CPMAS NMR, FT-IR, and DSC Analyses

et al. 2019

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The application of organic amendments to contaminated agricultural lands can immobilize metals and improve soil conditions. The chemical structures and long-term stability of commercial humic substances and other composted organic amendments (sheep and horse manure, vermicompost, pine bark, and pruning waste) were analyzed using 13C CPMAS NMR, FT-IR, and DSC to evaluate their use in soil remediation. The interactions of humic substances and manure with Cu (0 and 5000 mg kg−1) at different pH (2.5 and 5.0) were studied through a batch adsorption experiment observing the changes in their molecular structure using spectroscopic techniques. Humic substances exhibited high aromaticity and phenolic and carboxylic group content, with great affinity for Cu complexation. Humic substances and pruning waste were the most stable due to their high recalcitrant organic matter contents, whereas manure was the least stable, given the labile nature of its organic matter content. There were considerable changes in the carboxylic and phenolic groups of humic substances with pH, and also with Cu, albeit in a lesser extent, especially at pH 5.0, suggesting the great sorption capacity of humic substances and the key role of pH and these functional groups in metal complexation. Manure did not exhibit such changes. Commercial humic substances could be useful amendments for the remediation of contaminated agricultural soils due to their high sorption capacities and long-term stability.

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“…Gonet and Cieslewicz (1998) found significantly negative correlations between the H/C and N/C ratio of HA and their thermal stability. Provenzano and Senesi (1999) studied humic substances with DSC in combination with FTIR spectroscopy by placing samples in hermetically sealed capsules and analyzing under 20 mL min − 1 air flow.…”

Section: Typical Patterns Of Thermal Curves and Their Interpretationmentioning

confidence: 85%

Application of thermal analysis techniques in soil science

2009

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Differential thermal analysis of sedimentary humic acids in the light of their origin

Cited by 11 publications

References 5 publications

The physico-chemical properties and biostimulative activities of humic substances regenerated from lignite

The physico-chemical properties and biostimulative activities of humic substances regenerated from lignite

Evaluation of Commercial Humic Substances and Other Organic Amendments for the Immobilization of Copper Through 13C CPMAS NMR, FT-IR, and DSC Analyses

Application of thermal analysis techniques in soil science

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