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

Journal Article · Fri Nov 01 00:00:00 EST 1985 · Environ. Sci. Technol.; (United States)

DOI:https://doi.org/10.1021/es00141a008· OSTI ID:5621334

McCarthy, J F; Jimenez, B D

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 to 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.

• Research Organization: Oak Ridge National Lab., TN
• OSTI ID: 5621334
• Journal Information: Environ. Sci. Technol.; (United States), Vol. 19:1
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
HUMUS
SORPTIVE PROPERTIES
POLYCYCLIC AROMATIC HYDROCARBONS
ENVIRONMENTAL TRANSPORT
SORPTION
AQUATIC ECOSYSTEMS
BINDING ENERGY
DIALYSIS
DISSOCIATION
FLUORESCENCE
SEDIMENTS
SOLUTES
SUSPENSIONS
AROMATICS
DISPERSIONS
ECOSYSTEMS
ENERGY
HYDROCARBONS
LUMINESCENCE
MASS TRANSFER
ORGANIC COMPOUNDS
SEPARATION PROCESSES
SURFACE PROPERTIES
520200* - Environment
Aquatic- Chemicals Monitoring & Transport- (-1989)