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פותח על ידי קלירמאש פתרונות בע"מ -
Evidence for nonlinear binding of PAHs to dissolved humic acids
Year:
2002
Authors :
לאור, יעל
;
.
Volume :
36
Co-Authors:
Laor, Y., Faculty of Civil Engineering, Environmental and Water Resources Engineering, Technion, Haifa 32000, Israel, Institute of Soils, Water, and Environmental Sciences, The Volcani Center, Agricultural Research Organization, P.O. Box 6, Bet Dagan 50250, Israel
Rebhun, M., Faculty of Civil Engineering, Environmental and Water Resources Engineering, Technion, Haifa 32000, Israel
Facilitators :
From page:
955
To page:
961
(
Total pages:
7
)
Abstract:
Binding of pyrene, fluoranthene, and phenanthrene to dissolved humic acids (HA) was determined by the fluorescence quenching (FQ) and complexation-flocculation (CF) methods. Determinations by the CF method, using varying contaminant concentrations and a constant HA concentration, yielded nonlinear Freundlich-type isotherms (n = 0.65-0.84). Experiments using both the CF and the FQ methods with varying HA concentrations and a constant contaminant concentration yielded curved "Stern-Volmer"-type plots that also indicate nonlinear binding. These findings suggest that linear partitioning or site complexation in the presence of excess available sites cannot fully describe the interactions of hydrophobic compounds with dissolved humic material. Site-specific hydrophobic interactions at limited interior or external molecular surfaces may be considered.
Note:
Related Files :
Fluorescence
Hydrophobicity
PAH
Polycyclic Hydrocarbons, Aromatic
pyrene
Quenching
עוד תגיות
תוכן קשור
More details
DOI :
10.1021/es001996g
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
19124
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:26
Scientific Publication
Evidence for nonlinear binding of PAHs to dissolved humic acids
36
Laor, Y., Faculty of Civil Engineering, Environmental and Water Resources Engineering, Technion, Haifa 32000, Israel, Institute of Soils, Water, and Environmental Sciences, The Volcani Center, Agricultural Research Organization, P.O. Box 6, Bet Dagan 50250, Israel
Rebhun, M., Faculty of Civil Engineering, Environmental and Water Resources Engineering, Technion, Haifa 32000, Israel
Evidence for nonlinear binding of PAHs to dissolved humic acids
Binding of pyrene, fluoranthene, and phenanthrene to dissolved humic acids (HA) was determined by the fluorescence quenching (FQ) and complexation-flocculation (CF) methods. Determinations by the CF method, using varying contaminant concentrations and a constant HA concentration, yielded nonlinear Freundlich-type isotherms (n = 0.65-0.84). Experiments using both the CF and the FQ methods with varying HA concentrations and a constant contaminant concentration yielded curved "Stern-Volmer"-type plots that also indicate nonlinear binding. These findings suggest that linear partitioning or site complexation in the presence of excess available sites cannot fully describe the interactions of hydrophobic compounds with dissolved humic material. Site-specific hydrophobic interactions at limited interior or external molecular surfaces may be considered.
Scientific Publication
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