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 13_C 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 13_C 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.