Spectroscopic study (DRIFT, SERS and 1H NMR) of peat, leonardite and lignite humic substances

Diffuse reflectance infrared Fourier transform, surface-enhanced Raman and proton nuclear magnetic resonance spectroscopies were applied to investigate the structure of humic acids (HA) extracted from peat (P–HA), leonardite (Le–HA) and lignite (Li–HA) samples. The combined use of these techniques h...

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Bibliographic Details
Published inJournal of molecular structure Vol. 565-566; pp. 481 - 485
Main Authors Francioso, O, Sànchez-Cortés, S, Tugnoli, V, Marzadori, C, Ciavatta, C
Format Journal Article
LanguageEnglish
Published Elsevier B.V 30.05.2001
Subjects
1H NMR
Diffuse reflectance Fourier transform infrared
Humic acid
Surface-enhanced Raman
1H NMR
Diffuse reflectance Fourier transform infrared
Surface-enhanced Raman
Humic acid
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Summary:Diffuse reflectance infrared Fourier transform, surface-enhanced Raman and proton nuclear magnetic resonance spectroscopies were applied to investigate the structure of humic acids (HA) extracted from peat (P–HA), leonardite (Le–HA) and lignite (Li–HA) samples. The combined use of these techniques has shown a specific pattern of functional groups for each sample. P–HA was characterised by a greater content of oxygenate (COOH, C–OH in carbohydrates and phenols) and aliphatic groups. Le–HA and Li–HA showed a lower content of sugar-like components and polyethers. On the other hand, the aromatic structures were ubiquitous in all samples, although the different composition in Le–HA and Li–HA could be employed to identify and distinguish the HA in these two kinds of humic materials.
ISSN:0022-2860
1872-8014
DOI:10.1016/S0022-2860(00)00905-4