נגישות
menu      
חיפוש מתקדם
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
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.
פותח על ידי קלירמאש פתרונות בע"מ -
הספר "אוצר וולקני"
אודות
תנאי שימוש
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
You may also be interested in