Document Detail


Hydration of natural organic matter: effect on sorption of organic compounds by humin and humic acid fractions vs original peat material.
MedLine Citation:
PMID:  15352450     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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.
Authors:
Mikhail Borisover; Ellen R Graber
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental science & technology     Volume:  38     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2004 Aug 
Date Detail:
Created Date:  2004-09-08     Completed Date:  2005-01-31     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  4120-9     Citation Subset:  IM    
Affiliation:
Institute of Soil, Water and Environmental Sciences, ARO, The Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel. vwmichel@volcani.agri.gov.il
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MeSH Terms
Descriptor/Qualifier:
Adsorption
Alkanes / chemistry
Humic Substances*
Organic Chemicals / chemistry
Soil*
Solubility
Solvents / chemistry
Water / chemistry*
Chemical
Reg. No./Substance:
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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