Geochemical factors affecting PAH distribution in Chesapeake Bay sediments

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:460501

Mitra, S; Dickhut, R M; Kimbrough, K ^[1]

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1. Coll. of William and Mary, Williamsburg, VA (United States)

Sediment/pore water distribution coefficients (K{sub d}s) of selected polycyclic aromatic hydrocarbons (PAHs) were examined with depth at two sites in the Elizabeth River, a tributary of the Chesapeake Bay, Virginia. Areas of the Elizabeth River have been historically extensively contaminated with PAHs. Varying trends in distribution coefficients were observed both across the range of molecular weights of the PAHs and with depth in the sediment. Linear relations between log K{sub d} and octanol-water partition coefficient (log K{sub ow}) were observed deep in the cores but not near the surface of the sediments. This phenomena indicates that PAH sediment/porewater distributions are not at equilibrium near the sediment-water interface. Moreover, down-core K{sub d}s decreased and were, in most cases, inversely related with fraction organic carbon. These data indicate that dissolved organic carbon (DOC) may play a potentially significant role in mobilizing sediment-associated organic contaminants. The extent to which DOC and other geochemical parameters such as total lipid extract (TLE) and BET surface area control K{sub d}s of PAHs, is under further investigation.

• OSTI ID: 460501
• Report Number(s): CONF-961149--
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
CHESAPEAKE BAY
GEOCHEMISTRY
INTERSTITIAL WATER
MONITORING
POLYCYCLIC AROMATIC HYDROCARBONS
SEDIMENT-WATER INTERFACES
WATER POLLUTION