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. © 2001 Elsevier Science B.V.
Francioso O., Sanchez-Cortes S., Tugnoli V., Marzadori C., Ciavatta C. (2001). Spectroscopic study (DRIFT, SERS and1 H NMR) of peat, leonardite and lignite humic substances. JOURNAL OF MOLECULAR STRUCTURE, 565-566, 481-485 [10.1016/S0022-2860(00)00905-4].
Spectroscopic study (DRIFT, SERS and1 H NMR) of peat, leonardite and lignite humic substances
Francioso O.;Tugnoli V.;Marzadori C.;Ciavatta C.
2001
Abstract
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. © 2001 Elsevier Science B.V.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.