13C NMR and FTIR spectroscopy characterization of humic acids in spodosols under tropical rain forest in southeastern Brazil

González-Pérez, Martha; Vidal‐Torrado, Pablo; Colnago, Luiz Alberto; Martin‐Neto, Ladislau; Otero, Xosé Luís; Milori, Débora Marcondes Bastos Pereira; Gomes, Felipe Haenel

doi:10.1016/j.geoderma.2008.06.018

Cited by 62 publications

(30 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The Py-GC/MS results corroborate tho.se obtained by C VACP/MAS NMR and FTIR spectroscopy (González-Pérez et al, 2008). This is especially true for the following features:…”

Section: 0supporting

confidence: 85%

“…All profiles formed under hydromorphic conditions and are virtually Fe depleted, A description of the area, morphology of the profiles, and chemical and mineralogical data were given by Gomes et al, (2007aGomes et al, ( , 2007b. Micromorphological characteristics, the procedure used for extraction and purification of HAs, and the results of ^^C VACP/MAS NMR and FTIR spectroscopy were described in González-Pérez et al, (2008), Textures were analyzed by sieving and the pipette method (Buurman et al, 1996), Oxalate-extractable Fe and Al were also determined according to Buurman et al, (1996), Carbon and N were determined by a LECO CHN-1000 CN analyzer. For this study, we examined thin sections to check chemical interpretations,…”

Section: Materials and Methods Soils And Previous Analysesmentioning

confidence: 99%

“…Podzolization is the main pedogenic process in restinga soils, and the most common soils are Spodosols (Podzols) and Quartzipsamments (Arenosols) with incipient podzolization. This study addressed the same samples that were earlier studied by González-Pérez et al (2008) using'^C VACP/MAS NMR and FTIR spectroscopy. While NMR and FTIR inform about the main functional groups, Py-GC/MS identifies molecular fragments that can be attributed to, e.g,, polysaccharides, aliphatic biopolymers, lignin moieties, and fatty acids.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Pyrolysis‐Gas Chromatography/Mass Spectrometry Characterization of Humic Acids in Coastal Spodosols from Southeastern Brazil

González-Pérez

Buurman²,

Vidal‐Torrado³

et al. 2012

Soil Science Soc of Amer J

Self Cite

View full text Add to dashboard Cite

This study on humic acids (HAs) of podzol horizons from the southeastern region of Brazil investigated the accumulation and degradation of soil organic matter (SOM) in warm-climate podzols. Humic acids from sandy coastal Spodosols (Histic Alaquod and Arenic Alorthod) from Cardoso Island in Sao Paulo State were characterized by pyrolysis in combination with gas chromatography and mass spectrometry (Py-GC/MS). The soils developed on quartzitic, sandy, nutrient-poor parent materials under restinga forest in a coastal area. The Py-CC/MS results show that the chemical composition of HAs in B horizons in one out of three profiles was influenced by both dissolved organic C (DOC) and C from in situ decaying roots. Carbon derived from DOC dominated in the deepest part of the B horizons. In the Arenic Alorthod (H9) profile, SOM from the B horizon seemed to be largely derived from roots. The DOC-derived SOM was characterized by large contributions of phenol, methylphenols, and degraded polysaccharide products, while root contributions were mainly characterized by lignin products. Aliphatics were most abundant in A horizons (E and EB horizons were not analyzed). Both DOC-derived and lignin-derived SOM showed distinct degradation patterns. The Py-GC/MS results corroborate those obtained by ^^C variable amplitude cross polarization magic angle spinning nuclear magnetic resonance spectroscopy and Fourier-transform infrared spectroscopy. Molecular chemistry showed that podzol B horizons are variable in composition, and local influences, such as drainage and vertical or lateral water transport, and SOM decomposition play an important role in podzolization processes in warm climates.Abbreviations: DOC, dissolved organic carbon; FTIR, Eourier-transform infrared; HA, humic acid; OM, organic matter; Py-CC/MS, pyrolysis in combination with gas chromatography and mass spectrometry; SOM, soil organic matter; VACP/MAS NMR, variable amplitude cross polarization and magic angle spinning nuclear magnetic resonance.T he podzolization process in temperate regions has been investigated for a long time (Petersen, 1976;Chesworth and Macias-Vasquez, 1985;van Breemen and Buurman, 2002; Buutman et al., 2005). Although Spodosols of tropical and temperate climates are identified by the same set of tules, their genèses are different, and this aspect has hardly been investigated. Podzols, ot Spodosols, in general, ate characterized by a typical horizon sequence: an organic surface O horizon followed by a mineral A horizon, a weathered albic eluvial E horizon, and a dark brownish-reddish illuvial B horizon (Bh, Bhs, ot Bs), which is characterized by an accumulation of Al, Fe, ot both with varying amounts of otganic mattet (Wilcken et al., 1997; Soil Survey Staff, 1999;van Breemen and Buurman, 2002).

show abstract

“…The Py-GC/MS results corroborate tho.se obtained by C VACP/MAS NMR and FTIR spectroscopy (González-Pérez et al, 2008). This is especially true for the following features:…”

Section: 0supporting

confidence: 85%

Section: Materials and Methods Soils And Previous Analysesmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Pyrolysis‐Gas Chromatography/Mass Spectrometry Characterization of Humic Acids in Coastal Spodosols from Southeastern Brazil

González-Pérez

Buurman²,

Vidal‐Torrado³

et al. 2012

Soil Science Soc of Amer J

Self Cite

View full text Add to dashboard Cite

show abstract

“…The peaks observed have been frequently reported by other researchers who have used 13 C NMR to characterize HS (González-Pérez, et al, 2008;Esteves et al, 2009;Rosa et al, 2011;Schneckenburger et al, 2012;Myllote et al, 2015;Garcia et al, 2016).…”

Section: C Cpmas-nmr Spectroscopysupporting

confidence: 79%

Comparative characterization of humic substances extracted from freshwater and peat of different apparent molecular sizes

Rigobello¹,

Campos²,

Azevêdo³

et al. 2017

Rev. ambiente água

View full text Add to dashboard Cite

This paper compares the structural characteristics of aquatic humic substances (AHS) with humic substances from peat (HSP) through different analytical techniques, including elemental analysis, solid state 13 C cross polarization/magic-angle-spinning nuclear magnetic resonance spectroscopy ( 13 C CP-MAS NMR), ultraviolet/visible (UV/Vis) spectroscopy and Fourier transform infrared (FTIR) spectroscopy and total organic carbon (TOC). The AHS were extracted from water collected in a tributary of the Itapanhaú River (Bertioga/SP) using XAD 8 resin, and the HSP were extracted from peat collected in the Mogi Guaçu River bank (Luis Antonio/SP) with a KOH solution. After dialysis, both AHS and HSP extracts were filtered in membrane of 0.45 µm pore size (Fraction F1: < 0.45 µm) and fractioned by ultrafiltration in different apparent molecular sizes (AMS) (F2: 100 kDa-0.45 μm; F3: 30 kDa-100 kDa and F4: < 30 kDa). The extracts with the lowest AMS (F3 and F4) showed a higher number of aliphatic carbons than aromatic carbons, a higher concentration of groups containing oxygen and a higher percentage of fulvic acids (FA) than humic acids (HA) for both AHS and HSP. However, the AHS presented higher FA than HA content in relation to the HSP and distinct structural properties.Keywords: fulvic acid, humic acid, humic substances, ultrafiltration. 775Comparative characterization of humic substances … Rev. Ambient. Água vol. 12 n. 5 Taubaté -Sep. / Oct. 2017 Caracterização comparativa de substâncias húmicas extraídas de água e de turfa de diferentes tamanhos moleculares aparentes RESUMOEste artigo compara as características estruturais das substâncias húmicas aquáticas (SHA) com substâncias húmicas de turfa (SHT) usando diferentes técnicas analíticas, incluindo análise elementar, espectro de polarização cruzada de estado sólido 13 C/ espectroscopia de ressonância magnética nuclear ( 13 C CP-MAS RMN), espectroscopia no ultravioleta/visível e infravermelho com transformada de Fourier e carbono orgânico total (COT). As SHA foram extraídas de água coletada em um afluente do rio Itapanhaú (Bertioga/SP), utilizando resina XAD 8 e as SHT foram extraídas de turfa coletadas na margem do rio Mogi-Guaçu (Luis Antonio/SP) com uma solução de KOH. Após a diálise, ambos extratos de SHA e SHT foram filtrados em membrana com 0,45 m de tamanho de poro (Fração F1: < 0,45 m) e após fracionados através de ultrafiltração em diferentes tamanhos moleculares aparentes (F2: 100 kDa-0,45 m; F3: 30 -100 kDa e F4: < 30 kDa). Os extratos de menor tamanho (F3 e F4) apresentaram um maior número de átomos de carbono alifáticos do que de carbonos aromáticos, uma maior concentração de grupos contendo oxigênio e uma percentagem mais elevada de ácidos fúlvicos do que os ácidos húmicos para ambas as frações de SHA e de SHT. No entanto, as SHA apresentaram maior quantidade de ácidos fúlvicos que ácidos húmicos em relação às SHT e propriedades estruturais distintas.Palavras-chave: ácidos fúlvicos, ácidos húmicos, substâncias húmicas, ultrafiltração.

show abstract

“…The residue was freeze-dried for analysis by CPMAS 13 C NMR (Swift 1996). The spectra were acquired on a Bruker DSX 400-MHz spectrometer, with use of 7-mm-diameter sample (Chen and Chiu 2003;González-Pérez et al 2008;Novak and Smeck 1991). About 12,000 scans were collected for the HAs of soil samples and 10,000 scans for litter samples (Quideau et al 2001).…”

Section: Sample Preparation For Cpmas 13 C Nmr Spectroscopymentioning

confidence: 99%

Effects of afforestation on soil organic matter characteristics under subtropical forests with low elevation

Jien

Chen

Chiu

2011

Journal of Forest Research

View full text Add to dashboard Cite

We selected sites of natural broad-leaved forests and adjacent coniferous plantations (Cunninghamia konishii and Calocedrus formosana of 30 and 80 years old, respectively) in central Taiwan to evaluate the effects of plantations on soil organic matter (SOM) characteristics and composition. SOM was characterized by chemical analyses, solid-state 13 C cross-polarization magic-angle nuclear magnetic resonance (CPMAS 13 C NMR), and optical measurements. Semiquantitative analysis of CPMAS 13 C NMR spectra showed the litter of broad-leaved forests to be less resistant to decomposition than that of coniferous forests. The humification degree of SOM was higher under broadleaved than coniferous forests because of the relatively high percentage of aromatic C and carboxyl C in the humic acids (HAs) of A horizons under broad-leaved forests. Additionally, the E 4 /E 6 ratio of HAs was lower in the A horizon under broad-leaved than coniferous forests, which reflected more condensation of SOM. High alkyl C content under coniferous forests could be attributed to needle litter quality, which has a high content of waxes or lipids. Afforestation with conifers induced accumulation of the litterfall layer, gradually increased SOM concentrations, and changed the composition structures of SOM in the topsoils.

show abstract

13C NMR and FTIR spectroscopy characterization of humic acids in spodosols under tropical rain forest in southeastern Brazil

Cited by 62 publications

References 37 publications

Pyrolysis‐Gas Chromatography/Mass Spectrometry Characterization of Humic Acids in Coastal Spodosols from Southeastern Brazil

Pyrolysis‐Gas Chromatography/Mass Spectrometry Characterization of Humic Acids in Coastal Spodosols from Southeastern Brazil

Comparative characterization of humic substances extracted from freshwater and peat of different apparent molecular sizes

Effects of afforestation on soil organic matter characteristics under subtropical forests with low elevation

Contact Info

Product

Resources

About