1,721,104 research outputs found
Molecular properties of a fermented manure preparatione used as field spray in biodynamic agriculture
No full textCo-polymerization of penta-halogenated phenols in humic substances by catalytic oxidation using biomimetic catalysis
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Effects of field managements for soil organic matter stabilization on water-stable aggregates distribution and aggregate stability in three agricultural soils.
No full textMolecular Characterization of Compost at Increasing Stages of Maturity. 1. Chemical Fractionation and Infrared Spectroscopy
No full textMolecular characteristics of humic acids extracted from compost at increasing maturity stages
No full textThe molecular composition of humic acids (HA) extracted from compost at increasing maturity stages
was determined by off-line TMAH-thermochemolysis-GC-MS, in combination with solid-state nuclear
magnetic resonance (NMR) and infrared (IR) spectroscopies. While spectroscopy measurements followed
the bulk changes, thermochemolysis provided a detailed molecular variation of HA composition. Both
thermochemolysis and spectroscopy indicated that polysaccharides, alkyl, cyclic, and aromatic
compounds were the predominant components of HA, the stable fraction of compost. NMR dipolar
dephasing (DD) experiments confirmed that HA extracts contained lignin in lower amount than its
oxidized degradation products. The progressive compost maturity was reflected in HA extracts by
a decrease of carbohydrate content and a selective preservation of hydrophobic alkyl molecules, such as
medium- and long-chain fatty acids, aliphatic alcohols, linear hydrocarbons, and plant polyester derivatives,
like long-chain alkyl dicarboxylic acids, and u-hydroxyacids. Spectroscopy results showed
a concomitant entrapment in HA of biolabile compounds, such as peptidic moieties. The wide range of
identified lipid components and plant biomarkers may represent useful tools to trace origin, quality, and
transformation of amended compost in soil ecosystems
Carbon sequestration in soils by hydrophobic protection and in situ catalyzed Photo-polymerization of soil organic matter (SOM): chemical and physical-chemical aspects of SOM in fields
No full textRiduzione dell’inquinamento di un suolo contaminato da residui organici industriali per co-polimerizzazione ossidativa con catalisi biomimetica in un acido umico esogeno
No full textMolecular Characterization of Compost at Increasing Stages of Maturity. 2. Thermochemolysis-GC-MS and 13C-CPMAS-NMR Spectroscopy
No full textMolecular differences of humic substances obtained by selective etractants, as revealed by DRIFT infrared spectroscopy
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