Interactions between polycyclic aromatic hydrocarbons and dissolved humic material: binding and dissociation

Binding of polycyclic aromatic hydrocarbons (PAH's) to dissolved humic material (DHM) was examined by using equilibrium dialysis and fluorescence techniques. There was a direct relationship between the hydrophobicity of the PAH and the affinity for binding to DHM. The binding affinity P sub(a)...

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Bibliographic Details
Published in:	Environmental science & technology 1985-11, Vol.19 (11), p.1072-1076
Main Authors:	McCarthy, John F, Jimenez, Braulio D
Format:	Article
Language:	eng
Subjects:	Applied sciences Biological and physicochemical phenomena Exact sciences and technology Natural water pollution Pollution Water treatment and pollution
Online Access:	Get full text
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Summary:	Binding of polycyclic aromatic hydrocarbons (PAH's) to dissolved humic material (DHM) was examined by using equilibrium dialysis and fluorescence techniques. There was a direct relationship between the hydrophobicity of the PAH and the affinity for binding to DHM. The binding affinity P sub(a) for benzo(a)pyrene (BaP), benzanthracene, and anthracene decreased slightly as the concentration of DHM increased. The binding of BaP to DHM was completely reversible and the extent of reversibility was unrelated to the sorption time. The rate of binding of BaP to DHM, measured by the quenching of BaP fluorescence, was very rapid and was completed within 5-10 min. The results suggest that the presence of DHM, or other sorptive components of the dissolved organic pool, may affect binding to sediment or suspended particles and thus alter the fate and transport of organic contaminants in aquatic systems.
ISSN:	0013-936X 1520-5851