Structural variations of humic acids in two sola of Alberta Mollisols

Chen, Z.; Pawluk, S.

doi:10.1016/0016-7061(94)00049-g

Cited by 48 publications

(29 citation statements)

References 21 publications

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“…Humin (peat humin) and humic acid (peat HA) were extracted from this peat using the procedure outlined by Chen and Pawluk (1995). HA (Amherst HA) was also extracted from an organic soil collected from Amherst, Massachusetts.…”

Section: Methodsmentioning

confidence: 99%

“…This equation has been widely used in predictive models for the fate and transport of organic contaminants in soils and sediments. However, SOM is heterogeneous in nature (Grathwohl 1990;Xing et al 1994) and it can vary greatly as a function of its age, diagenesis, and mode of transformation (Rullkotter and Michaelis 1989;Chen and Pawluk 1995). Even within a single soil profile, the aromatic percentage of humic acids increased with depth (Chen and Pawluk 1995).…”

mentioning

confidence: 99%

“…However, SOM is heterogeneous in nature (Grathwohl 1990;Xing et al 1994) and it can vary greatly as a function of its age, diagenesis, and mode of transformation (Rullkotter and Michaelis 1989;Chen and Pawluk 1995). Even within a single soil profile, the aromatic percentage of humic acids increased with depth (Chen and Pawluk 1995). Variations in SOM strongly affect sorption capacity (K oc ), up to more than three orders of magnitude (Grathwohl 1990;Xing et al 1994;Xing 1997;Kleineidam et al 1999).…”

mentioning

confidence: 99%

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Sorption of anthropogenic organic compounds by soil organic matter: a mechanistic consideration

Xing¹

2001

Can. J. Soil. Sci.

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Xing, B. 2001. Sorption of anthropogenic organic compounds by soil organic matter: a mechanistic consideration. Can. J. Soil Sci. 81: 317-323. Sorption experiments with apolar organic compounds (naphthalene and 1,2-dichorobenzene) were conducted to evaluate sorption mechanisms in soil organic matter (SOM). All isotherms were nonlinear and competition between solutes was observed. Nonlinearity and competition increased in an order of peat humic acid (HA) < peat < peat humin. Isotherms of Al-saturated HA (Al-HA) were more nonlinear than untreated HA and Ca-HA, and sorption/desorption hysteresis occurred only in Al-HA. These results are not consistent with partitioning theory or the presence of high-surface-area carbonaceous materials (HSACM) in soil. But the results are consistent with dual-mode sorption, where SOM is postulated to have both condensed (rigid) and expanded (flexible) domains, and adsorption takes place only in the condensed domains and partitioning in both domains. These non-ideal sorptive behaviors need to be incorporated into predictive models to more accurately describe the fate and transport of organics in soil and subsurface environments.Key words: sorption, organic compounds, organic matter, dual-mode, partition, mechanisms Xing, B. 2001. Mécanique de la sorption des composés organiques anthropiques par la matière organique du sol. Can. J. Soil Sci. 81: 317-323. L'auteur a effectué des expériences sur la sorption de composés organiques apolaires (naphtalène et 1,2-dichlorobenzène) en vue d'approfondir la mécanique de la sorption dans la matière organique du sol (MOS). Les isothermes ne sont pas linéaires et les solutés se font concurrence. La non-linéarité et la concurrence s'intensifient selon la séquence « acide humique (AH) de la tourbe < tourbe < humine de la tourbe ». Les isothermes de l'AH saturé de Al (AH-Al) sont moins linéaires que ceux de l'AH non traité et de l'AH-Ca. Par ailleurs, on n'observe l'hystérésis de la sorption/désorption qu'avec l'AH-Al. Ces résultats ne sont pas cohérents avec la théorie du partage ni avec la présence de matière carbonée près de la surface, dans le sol. Ils sont toutefois cohérents avec la théorie de la sorption bimodale, qui repose sur le postulat que la MOS possède à la fois des domaines condensés (rigides) et expansés (souples), et que l'adsorption ne survient que dans les domaines condensés, alors qu'il y a partage dans les domaines des deux types. Il convient d'intégrer ces comportements non idéaux de la sorption aux modèles de prévision afin de mieux décrire le devenir et le transport de la matière organique dans le sol et le sous-sol.

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Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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Sorption of anthropogenic organic compounds by soil organic matter: a mechanistic consideration

Xing¹

2001

Can. J. Soil. Sci.

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“…Labeled cr-naphthol solutions were prepared by adding raC-cr-naphthol (purity > 95% by HPLC, SIGMA Chemical Co.) to the cr'-naphthol solutions (100'600 ppm) in sufficient amounts to produce an activity of 100 Bq mL l. Sorbents (Malcolm 1990;Schnitzer er al. 1991;Ricca and Severini 1993;Chen and Pawluk 1995); (2) different size fractions of soil aggregates (Catroux and Schnitzer 1987); (3) aqueous bodies (Malcolm and MacC-arthy 1986; Malcoim 1990) and (4) commercial products (Malcolm and MacCarthy 1986). One group of literature data (Malcolm and …”

Section: Whole Soils and Sedimentsmentioning

confidence: 99%

“…from Ko* (Means et al 1980;Briggs 1981; Ctriou tese;l"Such modiits treat the organic phase as homo3Author to whom correspondence should be addressed' geneous with partitioning behavior parallel to that of octanol. However, organic sorbents in soils and sediments are complex (Schnitzer 1991;Xing 1994;Chen 1995;Chen and Pawluk 1995;Murphy and Zachata 1995)' The aromaticity of organic substances in soils and sediments depends on the extent of biological alteration during pedogenesis (Chen and Pawluk 1995) or the mode of geological iiagenesis (Grathwohl 1990) Chen and pawluk (1995) in which increasing aromaricity with soii depth was reported. Further micromorphological examination and X_ ray diffraction analysis revealed that soil organic matter was associated with soil strucfural developmeit (Chen 1995 Sanborn and pawluk (1983).…”

mentioning

confidence: 99%

α-Naphthol sorption as regulated by structure and composition of organic substances in soils and sediments

Chen¹,

McGill²,

Dudas³

et al. 1996

Can. J. Soil. Sci.

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The chemical composition of soil organic matter in classical humic compound fractions and in bulk samples — a review

Beyer

1996

J Plant Nutrition & Soil

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In the present paper new findings in soil organic matter (SOM) research were reviewed with regard to non‐aromatic species in order to make evident the recent conception about the chemical nature of humic matter structure. The main purpose of this paper was to unravel the manifold information of SOM investigations in order to characterize the classical humic matter fractions (fulvic acids, humic acids, humins) and bulk soil samples. Such common state‐of‐the‐art information is missing in current SOM literature. In addition we focus on improvements in SOM research due to the application of the new instrumental methods such as NMR and pyrolysis‐MS and its problems of analysis.

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Structural variations of humic acids in two sola of Alberta Mollisols

Cited by 48 publications

References 21 publications

Sorption of anthropogenic organic compounds by soil organic matter: a mechanistic consideration

Sorption of anthropogenic organic compounds by soil organic matter: a mechanistic consideration

α-Naphthol sorption as regulated by structure and composition of organic substances in soils and sediments

The chemical composition of soil organic matter in classical humic compound fractions and in bulk samples — a review

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