CPMAS 13 C NMR characterization of humic acids from composted agricultural Saudi waste
نویسندگان
چکیده
منابع مشابه
Comparison of the Solid State CPMAS and Solution Carbon-13-NMR Spectra of Humic Acids Extracted from Composted Municipal Refuse
The solution and CPMAS spectra of humic acids extracted from the composted municipal refuse of three Spanish cities (Sevilla, Granada and Puerto Real) have been obtained at 75.4 MHz. The spectra are discussed qualitatively and the signals assigned to the various chemical struc tures forming the humic acids. It is attempted to learn the limits for the quantitative determination of signal areas ...
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A humic acid extracted from a volcanic soil was subjected to preparative high-performance size-exclusion chromatography (HPSEC) to reduce its molecular complexity and eleven different size fractions were obtained. Cross-polarization magic-angle spinning 13C NMR (CPMAS 13C NMR) analysis performed with variable contact-time (VCT) pulse sequences showed that the largest molecular-size fractions co...
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Humic substances, i.e. dark paramagnetic polymeric anionic polyelectrolytes, belong to the most widespread macromolecular substances of biogenic origin in soil and aquatic environments. The exact structure of humic substances is unknown because of their complexity resulting from unrecurring precursors, from their composition and their process of synthesis. Degradation processes of these substan...
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A strain of Pewicillizi?tz freqzientans was successfully employed for partial degradation and characterization of humic acids. Salicyl alcohol and salicylalclehyde were detected i n culture filtrates of the fungus ~rtilizing humates under reduced oxygen tension. The enzyme systems iiivolved in the degradation of humic acids were adaptive. The humate-adapted lnyceliirln was capable of metabolizi...
متن کامل13 C CP / MAS NMR Spectra
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ژورنال
عنوان ژورنال: Arabian Journal of Chemistry
سال: 2017
ISSN: 1878-5352
DOI: 10.1016/j.arabjc.2012.12.018