Evidence for particle-mediated transport of 2,3,7,8-tetrachlorodibenzofuran during gas sparging of natural water

Journal Article · Mon Nov 01 04:00:00 EST 1993 · Environmental Toxicology and Chemistry; (United States)

DOI:https://doi.org/10.1002/etc.5620121110· OSTI ID:5815094

Friesen, K J; Loewen, M D ^[1]; Fairchild, W L ^[2]; Lawrence, S G; Holoka, M H; Muir, D C.G. ^[3]

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1. Univ. of Winnipeg, Manitoba (Canada). Dept. of Chemistry
2. Univ., of Manitoba, Winnipeg, Manitoba (Canada). Dept. of Soil Science
3. Freshwater Inst., Winnipeg, Manitoba (Canada). Dept. of Fisheries and Oceans

Gas sparging was conducted in lake enclosures previously treated with [4,6[sup 3]-H]-2,3,7,8-tetrachlorodibenzofuran (TCDF) to determine the fugacity or dissolved concentration of this hydrophobic contaminant under the field conditions. Using a Henry's law constant for TCDF of 1.7[+-]0.8Pa[times]m[sup 3]/mol, measured experimentally by gas sparging, apparent dissolved TCDF concentrations of 7 to 22 pg/L were determined. These results were 100 times greater than concentrations of TCDF obtained by extraction of water samples from the same enclosures with dichloromethane. TCDF was found to be highly associated with naturally occurring particles in the water column, with 40% of sorbed TCDF associated with the 0.1- to 3-[mu]m size fraction. The results are interpreted in light of previous reports that indicate that bubbles are effective scavengers of bacteria and particulates in natural waters, transporting these solids across the water/air interface as bubbles burst at the water surface. In the laboratory addition of a yeast suspension increased the amount of TCDF sparged from aqueous solutions, confirming that particle-mediated movement of highly sorbed contaminants can influence apparent water concentrations measured by gas sparging on natural waters.

• OSTI ID: 5815094
• Journal Information: Environmental Toxicology and Chemistry; (United States), Journal Name: Environmental Toxicology and Chemistry; (United States) Vol. 12:11; ISSN 0730-7268; ISSN ETOCDK
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540320* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
BENZOFURANS
ECOLOGICAL CONCENTRATION
ENVIRONMENTAL TRANSPORT
FURANS
HETEROCYCLIC COMPOUNDS
LAKES
MASS TRANSFER
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
POLLUTION
SURFACE WATERS
WATER POLLUTION