STUDIES ON THE STRUCTURE OF HUMIC SUBSTANCES EXTRACTED FROM DIFFERENT SOILS | ||
| Journal of Soil Sciences and Agricultural Engineering | ||
| Article 4, Volume 29, Issue 6, June 2004, Pages 3639-3650 PDF (1.08 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jssae.2004.241938 | ||
| Author | ||
| A. A. Taha | ||
| Soils Dept., Fac, of Agrie., Mansoura Univ., Egypt | ||
| Abstract | ||
| Humic and fulvic acids were extracted from normal (non-saune), saane, alkaline and newly reclaimed salt affected soils. These humic substances were characterized in terms of chemical composition. functional groups analysis, infrared spectrometry (IR) and solid-state 13C cross-potarization magic angle spinning nuclear magnetic resonance 13C{CPMAS)NMR spectrometry. Large variations in chemical, functional groups and spectroscopic measurements were observed among the .• extracted humic and fulvie acids. More humic substance were extracted from the . normal soU than other soils, with the majority being humic acids. Small amounts of fulvic aclds were recovered from all studied soils. Data from elemental analysis and 13C NMR spectroscopy indicated that humic and fulvic acids extracted (rom normal and saline were more aromatic than those of alkaline and newly reclaimed soils. Fulvic acids extracted from all soils contained mosUy aliphatic, O-substituted alkyl, and carboxylic groups and small amounts of carbonyl groups. No difference were detected between the hurmc substances by IR spec1roscopy . The humic acids extracted from the newly reclaimed soi! is less humified than those of the other soils. | ||
| Keywords | ||
| humic acids; fulvic acids; elemental composition. functional groups; IR | ||
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