Characterization of Humic Acid-Like Material Isolated From the Humin Fraction of a Topsoil

Song, Jianzhong; Peng, Ping’an; Huang, Weilin

doi:10.1097/01.ss0000180065.91004.19

Cited by 16 publications

(11 citation statements)

References 49 publications

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“…), the relatively small aromatic carbon content at 110-140 p.p.m., and the sharp resonances from carboxylic, esters, amide carbons at 172 p.p.m. This DMSO humin fraction has features similar to other humin fractions described in the literature (Hatcher et al, 1980;Preston & Newman, 1995;Fabbri et al, 1998;Hu et al, 2000;Song et al, 2005;Wang & Xing, 2005).…”

Section: Dmso Huminsupporting

confidence: 74%

Sequential exhaustive extraction of a Mollisol soil, and characterizations of humic components, including humin, by solid and solution state NMR

Song¹,

Novotny²,

Simpson³

et al. 2008

European J Soil Science

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A comprehensive sequential extraction procedure was applied to isolate soil organic components using aqueous solvents at different pH values, base plus urea (base-urea), and finally dimethylsulfoxide (DMSO) plus concentrated H 2 SO 4 (DMSO-acid) for the humin-enriched clay separates. The extracts from baseurea and DMSO-acid would be regarded as 'humin' in the classical definitions. The fractions isolated from aqueous base, base-urea and DMSO-acid were characterized by solid and solution state NMR spectroscopy. The base-urea solvent system isolated ca. 10% (by mass) additional humic substances. The combined base-urea and DMSO-acid solvents isolated ca. 93% of total organic carbon from the humin-enriched fine clay fraction (<2 mm). Characterization of the humic fractions by solid-state NMR spectroscopy showed that oxidized char materials were concentrated in humic acids isolated at pH 7, and in the base-urea extract. Lignin-derived materials were in considerable abundance in the humic acids isolated at pH 12.6. Only very small amounts of char-derived structures were contained in the fulvic acids and fulvic acids-like material isolated from the base-urea solvent. After extraction with baseurea, the 0.5 M NaOH extract from the humin-enriched clay was predominantly composed of aliphatic hydrocarbon groups, and with lesser amounts of aromatic carbon (probably including some char material), and carbohydrates and peptides. From the combination of solid and solution-state NMR spectroscopy, it is clear that the major components of humin materials, from the DMSO-acid solvent, after the exhaustive extraction sequence, were composed of microbial and plant derived components, mainly long-chain aliphatic species (including fatty acids/ester, waxes, lipids and cuticular material), carbohydrate, peptides/proteins, lignin derivatives, lipoprotein and peptidoglycan (major structural components in bacteria cell walls). Black carbon or char materials were enriched in humic acids isolated at pH 7 and humic acids-like material isolated in the base-urea medium, indicating that urea can liberate charderived material hydrogen bonded or trapped within the humin matrix.

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Section: Dmso Huminsupporting

confidence: 74%

Sequential exhaustive extraction of a Mollisol soil, and characterizations of humic components, including humin, by solid and solution state NMR

Song¹,

Novotny²,

Simpson³

et al. 2008

European J Soil Science

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“…These atomic ratios are often used to describe characteristic and structural changes of organic macromolecules (Lu et al 2000;Song et al 2002Song et al , 2005. The results show that O/C atomic ratios for HULIS are similar to those for standard fulvic acids (Duarte et al 2007), while the H/C atomic ratios for HULIS are substantially higher (Duarte et al 2007).…”

Section: Elemental Compositionsmentioning

confidence: 53%

Chemical and Isotopic Composition of Humic-Like Substances (HULIS) in Ambient Aerosols in Guangzhou, South China

Song

Peng

et al. 2012

Aerosol Science and Technology

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Humic-like substances (HULIS) constitute a class of organic compounds identified in atmospheric samples that influence many properties of aerosols in the atmosphere. In this study, 6 HULIS samples were isolated from atmospheric total suspended particle (TSP) samples collected at 3 locations in Guangzhou of China, 1 each in summer and winter. On the basis of analyses by elemental analyzer, more detailed chemical species of elements were explored by proton nuclear magnetic resonance ( China (No. 40975090, 40830745, and 40505026) and the Guangdong Natural Science Foundation (9151064004000008). This is contribution No. IS-1414 from GIGCAS. We also thank 2 anonymous reviewers for their valuable comments and suggestions on the original manuscript.Address correspondence to Ping'an Peng, State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, P. R. China. E-mail: pinganp@gig.ac.cn in urban areas biomass-derived carbon was the major component in the atmospheric HULIS samples.

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“…Desert soils are usually composed of higher quantities of fulvic acids (as high as 40 percent) than humic acids and humin [ Stevenson , 1994]. The fulvic acids are usually smaller molecules than humic acids but contain a larger number of functional groups (mostly carboxylic), with an OC/OM conversion factor of higher than 2.5 (1.9 or less for humic acids) [ Song et al , 2005]. As a result, it is possible that a large fraction of organic aerosol emitted during the first period of the burn may be associated with soil fulvic acids.…”

Section: Resultsmentioning

confidence: 99%

In situ observations of soil minerals and organic matter in the early phases of prescribed fires

et al. 2012

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We examined the chemical composition of aerosol samples collected during a prescribed fire at a Great Basin Desert site in the context of samples collected from controlled combustion of vegetation clippings from the same site and resuspension of soil samples obtained prior to and after the burn event. We observed a distinct difference in the composition of organic carbon resuspended soil dust after the burn, reflecting changes caused by the heating of the soil. The relative abundances of minerals and organic carbon fractions in aerosols collected during the first period of the burn were identical to those measured in soil dust. For aerosol samples collected for the remaining two periods of the burn event, the profiles of both minerals and organic carbon matched quite well those observed for vegetation combustion. Reconstruction of aerosol samples collected during the burn event showed that vegetation combustion dominated emissions but mineral soil dust may account for about 10% of PM10emissions (reconstructed) during the early stages of the fire. A large fraction of emissions during the first two hours was also unaccounted mainly because of the insufficient conversion of organic carbon to organic mass. The abundance of heavier non‐volatile organics in soil dust suggested the presence of humic/fulvic acids that exhibit higher OM‐to‐OC ratios and thus, account for a proportion of the unaccounted emissions. These findings indicated that soil dust may be released into the air during a fire event, probably due to the enhanced turbulent mixing near the burn front.

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Characterization of Humic Acid-Like Material Isolated From the Humin Fraction of a Topsoil

Cited by 16 publications

References 49 publications

Sequential exhaustive extraction of a Mollisol soil, and characterizations of humic components, including humin, by solid and solution state NMR

Sequential exhaustive extraction of a Mollisol soil, and characterizations of humic components, including humin, by solid and solution state NMR

Chemical and Isotopic Composition of Humic-Like Substances (HULIS) in Ambient Aerosols in Guangzhou, South China

In situ observations of soil minerals and organic matter in the early phases of prescribed fires

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