Effect of dissolved organic macromolecules on exposure of aquatic organisms to organic contaminants

Conference · Wed Jan 01 04:00:00 EST 1986

OSTI ID:5532605

McCarthy, J F; Black, M C

Hydrophobic organic contaminants in aquatic systems bind to sediments or to suspended particles, and these associations affect the transport and bioavailability of contaminants and thus alter the exposure received by biota. We present evidence demonstrating the importance of another less obvious natural sorbent - dissolved organic macromolecules (DOM), such as dissolved humic materials - in altering the environmental fate of contaminants. Binding of a polyaromatic hydrocarbon, benzo(a)pyrene, to DOM and to particles was measured for each sorbent and in a mixed system containing both sorbents. DOM competed with particles for binding of the dissolved contaminant and reduced the amount bound to particles. Binding to each sorbent was independent and noninteractive. Based on these results, equations were developed to indicate those environments and ecosystems for which failure to account for the role of DOM as a sorbent would result in 50 or 90% errors in steady state predictions about the exposure of aquatic organisms to contaminants.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5532605
• Report Number(s): CONF-8605137-2; ON: DE86011765
• Country of Publication: United States
• Language: English

Related Subjects

520200* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AQUEOUS SOLUTIONS
AROMATICS
BENZOPYRENE
CONDENSED AROMATICS
DATA
DISPERSIONS
EXPERIMENTAL DATA
HYDROCARBONS
INFORMATION
KINETICS
MIXTURES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC MATTER
PARTICLES
PARTICULATES
REACTION KINETICS
SOLUTES
SOLUTIONS
SORPTION