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Hydration-facilitated sorption of specifically interacting organic compounds by model soil organic matter
Year:
1998
Authors :
Borisover, Mikhail
;
.
Graber, Ellen
;
.
Volume :
32
Co-Authors:
Graber, E.R., Inst. Soils, Water, Environ. Sci., Volcani Center, A. R. O., P. O. B. 6, Bet Dagan 50250, Israel
Borisover, M.D., Inst. Soils, Water, Environ. Sci., Volcani Center, A. R. O., P. O. B. 6, Bet Dagan 50250, Israel
Facilitators :
From page:
258
To page:
263
(
Total pages:
6
)
Abstract:
Site-specific interactions between organic compounds and soil organic matter (SOM) may occur at surface sites or limited interior sites; limited sites can have either a specific force component (e.g., hydrogen bonding) or a nonspecific force component (van der Waals) or both. This research addresses sorption specificity to gain an understanding of SOM structure. Sorption of phenol, pyridine, and atrazine on Pahokee peat, a mineral-free SOM endmember, was measured as a function of solute activity in hydrated and dehydrated conditions. Sorption of phenol and pyridine from water at low solute activities was the same as from n-hexadecane; sorption at high solute activities was much greater from water than from n-hexadecane. Uptake of atrazine at high activities was not influenced by peat hydration. Sorption isotherms measured in nonaqueous systems were more nonlinear than those measured in water. The increase in sorption on hydrated peat at high pyridine and phenol activities is attributed to an increase in sorption sites resulting from penetration of solute molecules between polar peat contacts which are either previously solvated by water or solvated during penetration of the solute. High solute activities are necessary for simultaneous disruption of multiple points of contact in the hydrated SOM macromolecular complex.Site-specific interactions between organic compounds and soil organic matter (SOM) may occur at surface sites or limited interior sites; limited sites can have either a specific force component (e.g., hydrogen bonding) or a nonspecific force component (van der Waals) or both. This research addresses sorption specificity to gain an understanding of SOM structure. Sorption of phenol, pyridine, and atrazine on Pahokee peat, a mineral-free SOM endmember, was measured as a function of solute activity in hydrated and dehydrated conditions. Sorption of phenol and pyridine from water at low solute activities was the same as from n-hexadecane; sorption at high solute activities was much greater from water than from n-hexadecane. Uptake of atrazine at high activities was not influenced by peat hydration. Sorption isotherms measured in nonaqueous systems were more nonlinear than those measured in water. The increase in sorption on hydrated peat at high pyridine and phenol activities is attributed to an increase in sorption sites resulting from penetration of solute molecules between polar peat contacts which are either previously solvated by water or solvated during penetration of the solute. High solute activities are necessary for simultaneous disruption of multiple points of contact in the hydrated SOM macromolecular complex.
Note:
Related Files :
Atrazine
herbicides
Nitrogen compounds
phenol
phenols
pyridine
soil chemistry
soil pollution
water
Show More
Related Content
More details
DOI :
10.1021/es9705957
Article number:
0
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
22431
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:51
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Scientific Publication
Hydration-facilitated sorption of specifically interacting organic compounds by model soil organic matter
32
Graber, E.R., Inst. Soils, Water, Environ. Sci., Volcani Center, A. R. O., P. O. B. 6, Bet Dagan 50250, Israel
Borisover, M.D., Inst. Soils, Water, Environ. Sci., Volcani Center, A. R. O., P. O. B. 6, Bet Dagan 50250, Israel
Hydration-facilitated sorption of specifically interacting organic compounds by model soil organic matter
Site-specific interactions between organic compounds and soil organic matter (SOM) may occur at surface sites or limited interior sites; limited sites can have either a specific force component (e.g., hydrogen bonding) or a nonspecific force component (van der Waals) or both. This research addresses sorption specificity to gain an understanding of SOM structure. Sorption of phenol, pyridine, and atrazine on Pahokee peat, a mineral-free SOM endmember, was measured as a function of solute activity in hydrated and dehydrated conditions. Sorption of phenol and pyridine from water at low solute activities was the same as from n-hexadecane; sorption at high solute activities was much greater from water than from n-hexadecane. Uptake of atrazine at high activities was not influenced by peat hydration. Sorption isotherms measured in nonaqueous systems were more nonlinear than those measured in water. The increase in sorption on hydrated peat at high pyridine and phenol activities is attributed to an increase in sorption sites resulting from penetration of solute molecules between polar peat contacts which are either previously solvated by water or solvated during penetration of the solute. High solute activities are necessary for simultaneous disruption of multiple points of contact in the hydrated SOM macromolecular complex.Site-specific interactions between organic compounds and soil organic matter (SOM) may occur at surface sites or limited interior sites; limited sites can have either a specific force component (e.g., hydrogen bonding) or a nonspecific force component (van der Waals) or both. This research addresses sorption specificity to gain an understanding of SOM structure. Sorption of phenol, pyridine, and atrazine on Pahokee peat, a mineral-free SOM endmember, was measured as a function of solute activity in hydrated and dehydrated conditions. Sorption of phenol and pyridine from water at low solute activities was the same as from n-hexadecane; sorption at high solute activities was much greater from water than from n-hexadecane. Uptake of atrazine at high activities was not influenced by peat hydration. Sorption isotherms measured in nonaqueous systems were more nonlinear than those measured in water. The increase in sorption on hydrated peat at high pyridine and phenol activities is attributed to an increase in sorption sites resulting from penetration of solute molecules between polar peat contacts which are either previously solvated by water or solvated during penetration of the solute. High solute activities are necessary for simultaneous disruption of multiple points of contact in the hydrated SOM macromolecular complex.
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