Humic acids in the first generation of EUROSOILS

Senesi, N.; D’Orazio, Valeria; Ricca, Giuliana

doi:10.1016/s0016-7061(03)00107-1

Cited by 285 publications

(183 citation statements)

References 8 publications

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“…All spectra feature common and distinctive absorption bands, with some differences in their relative intensity. The main characteristics (Stevenson 1994;Senesi et al 2003).…”

Section: Resultsmentioning

confidence: 99%

Spectral characterization of selected humic substances

Enev¹,

Pospíšilová²,

Klučáková³

et al. 2014

Soil Water Res.

102

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Enev V., Pospíšilová L., Klučáková M., Liptaj T., Doskočil L. (2014): Spectral characterization of selected humic substances. Soil & Water Res., 9: 9-17.Current concern for soil quality has stimulated research on soil organic matter (OM). Humic substances (HS) of different origin were compared applying ultraviolet-visible spectroscopy, Fourier transform infrared spectroscopy (FTIR), "steady-state" fluorescence spectroscopy, and 13 C nuclear magnetic resonance ( 13 C NMR).Sodium humates samples were isolated from soil (Gleyic Luvisol), compost, and South-Moravian lignite from the mine Mír in Mikulčice. Sodium humates (SH) were extracted by a conventional procedure recommended by the International Humic Substances Society (IHSS). Results showed that the presence of O-containing functional groups (carbonyl in aldehydes and ketones, carboxyl in carboxylic acids, ester and ether groups) are in the order of compost > soil > lignohumate > lignite. Further, results of FTIR, fluorescence spectroscopy, and 13 C NMR suggested that samples of sodium humates isolated from soil, compost, and lignite were a more polycondensed, oxidized, unsaturated, humified, and aromatic structure. On the other hand, commercial lignohumate (LH) had very simple structural components and wide molecular heterogeneity. Furthermore, a small molecular size and weight, low degree of aromatic polycondensation, low level of conjugated chromophores and fluorophores, and low humification degree were characteristic for commercial LH. It should be noted that the sample of commercial LH was characterized by 13 C NMR analysis with a slightly higher value of aromaticity α in comparison with the sample of compost. The application of non-destructive analytical methods such as UV-VIS, FTIR, 13 C NMR, and fluorescence spectroscopy help us to provide main characteristics of selected humic substances.

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“…All spectra feature common and distinctive absorption bands, with some differences in their relative intensity. The main characteristics (Stevenson 1994;Senesi et al 2003).…”

Section: Resultsmentioning

confidence: 99%

Spectral characterization of selected humic substances

Enev¹,

Pospíšilová²,

Klučáková³

et al. 2014

Soil Water Res.

102

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“…The band of 1720 and 1656 cm -1 is due to the CdO stretching. The 1410-1467 cm -1 in the lipid fraction is the deformation of aliphatic C-H (19). The absorbance at 1130 cm -1 is C-OH stretching of aliphatic O-H.…”

Section: Resultsmentioning

confidence: 99%

Phenanthrene Sorption to Soil Humic Acid and Different Humin Fractions

Wen

Zhang

et al. 2007

Environ. Sci. Technol.

149

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This study was undertaken to provide an insight into the effect of heterogeneous soil organic matter (SOM) on the sorption of phenanthrene. Humic acid (HA) and humin were extracted from a peat soil. Humin was further fractionated into bound-humic acid (BHA), lipid, and insoluble residue (IR) fractions. Heterogeneous natures of these fractions were characterized by elemental analysis, ultraviolet-visible spectroscopy, Fourier transform infrared spectroscopy, and solid-state 13 C NMR. Aliphaticity of the fractions followed the order lipid >BHA > HA > IR, while the polarity order was IR > BHA> HA > lipid. Sorption of phenanthrene on these fractions fitted the Freundlich equation, suggesting that phenanthrene sorption isotherms of lipid were almost linear (N ) 0.993), while those of HA, BHA, and IR were nonlinear, with N values ranging from 0.723 to 0.910. The N values followed the order lipid > HA > BHA > IR and were significantly correlated inversely with their polarities (p < 0.05). Organic carbon-normalized sorption coefficients (K FOC ) were independent of aliphatic or aromatic contents of the SOM fractions. The results suggested that SOM, especially for the humin fractions, was highly heterogeneous in terms of elemental composition, structure, and polarity. Such heterogeneity was considered to be responsible for the nonlinear sorption of phenanthrene.

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“…The newest concept attributed to HS is an association of molecular structures (100-2000 Da) with macromolecular characteristics resulting from aggregates formed by hydrogen bonding, nonpolar interactions, and polyvalent cation interactions (Piccolo, et al, 2002;Simpson et al, 2002). FTIR spectroscopy has been extensively used in the study of the composition, structure and functionalities of HS isolated from different ecosystems (Aguiar, et al, 2013;Baigorri, et al, 2009;D'Orazio and Senesi, 2009;Du and Zhou, 2009;Ferrari, et al, 2011;Francioso, et al, 2009;Senesi, et al, 2003;Stevenson, 1994;Tatzber, et al, 2008;Zhang, et al, 2011). Typical IR absorption of HS shows: a broad band at 3100-3600 cm -1 (H-bonded OH and NH groups), a slight shoulder at 3000-3100 cm -1 (aromatic C-H stretching), a band at 2800-3000 cm -1 (aliphatic C-H stretching), a broad band at 2600 cm -1 (hydrogen-bonded OH stretching of carboxyl and phenolic OH), a shoulder or a peak at 1725-1710 cm -1 (C=O stretching of COOH and ketones), a strong band at 1660-1630 cm -1 (C=O stretching of amide I, quinone and ketones), a band at 1630-1600 cm -1 (aromatic C=C stretching, -COO -asymmetric stretching), an absorption at 1540-1510 cm -1 (amide II, aromatic C=C stretching), a peak or a shoulder at 1490-1440 cm -1 (CH deformation of CH 2 and CH 3 , -COOsymmetric stretching), a band at 1450-1380 cm -1 (aliphatic CH deformation, -COOsymmetric stretching, OH deformation), a band at 1300-1200 cm -1 (C-O stretching of phenols and ethers, C-OH deformation) and a band at 1170-1030 cm -1 (C-O stretching of polysaccharide, C-O-C stretching in ethers, C-O of polyalcohol).…”

Section: Humic Substances Characterizationmentioning

confidence: 99%

Recent applications of vibrational mid-Infrared (IR) spectroscopy for studying soil components: a review

Tinti¹,

Tugnoli²,

Bonora³

et al. 2015

j. cent. eur. agric.

182

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The present review highlights the recent applications of mid-infrared spectroscopy and in particular of diffuse reflectance spectroscopy (DRIFT) and attenuated total reflectance (ATR) and processing methods (e.g., deconvolution, derivative and chemometrics) to rapidly provide valuable information on soil composition and organic geochemistry. Research has demonstrated that both DRIFT and ATR techniques can be considered useful tools for the analysis of a large number of soil samples, giving not only typical spectral patterns but permitting an accurate prediction of quantitative parameters such as, e.g., total carbon, total nitrogen, C/N ratio, lignin, dissolved OC, carbonyl-C, aromatic-C, O-alkyl-C, and alkyl-C contents. Based on literature results, infrared spectroscopy can be recognized as one of the most promising analytical techniques for investigating soil science.

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Humic acids in the first generation of EUROSOILS

Cited by 285 publications

References 8 publications

Spectral characterization of selected humic substances

Spectral characterization of selected humic substances

Phenanthrene Sorption to Soil Humic Acid and Different Humin Fractions

Recent applications of vibrational mid-Infrared (IR) spectroscopy for studying soil components: a review

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