| Hydration of natural organic matter: effect on sorption of organic compounds by humin and humic acid fractions vs original peat material. | |
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MedLine Citation:
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PMID: 15352450 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Natural organic matter (NOM) hydration is found to change activity-based sorption of test organic compounds by as much as 2-3 orders of magnitude, depending on the compound and the specific NOM sorbent. This is demonstrated for sorption on humin, humic acid, and the NOM source material. Hydration assistance in organic compound sorption correlates with the ability of the sorbate to interact strongly with hydrated sorbents, demonstrating the important role of noncovalent polar links in organizing the sorbent structure. Differences in hydration effect between the sorbents are caused mainly by differences in compound-sorbent interactions in the dry state. For a given compound, hydration of the sorbent tends to equalize the sorption capability of the three sorbents. No correlation was found between the strength of sorbate-sorbent interactions or the type of sorbate functional groups and the extent of sorption nonlinearity. Sorption nonlinearity compared over the same sorbed concentration range is greater on the original NOM than on either of the two extracted fractions. In elucidating sorption mechanisms on hydrated NOM, it is important to explicitly consider the participation of water molecules in organic compound interactions in the NOM phase. |
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Authors:
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Mikhail Borisover; Ellen R Graber |
Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Environmental science & technology Volume: 38 ISSN: 0013-936X ISO Abbreviation: Environ. Sci. Technol. Publication Date: 2004 Aug |
Date Detail:
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Created Date: 2004-09-08 Completed Date: 2005-01-31 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0213155 Medline TA: Environ Sci Technol Country: United States |
Other Details:
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Languages: eng Pagination: 4120-9 Citation Subset: IM |
Affiliation:
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Institute of Soil, Water and Environmental Sciences, ARO, The Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel. vwmichel@volcani.agri.gov.il |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adsorption Alkanes / chemistry Humic Substances* Organic Chemicals / chemistry Soil* Solubility Solvents / chemistry Water / chemistry* |
| Chemical | |
Reg. No./Substance:
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0/Alkanes; 0/Humic Substances; 0/Organic Chemicals; 0/Soil; 0/Solvents; 0/humin; 544-76-3/n-hexadecane; 7732-18-5/Water |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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