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4.42 2 Consider 100 m 3 of lake water in equilibrium with 100 m 3 of air. A 1 lb
catfish resides in the lake water. The air above the lake is found to have
traces of a pesticide (lindane) at a concentration of 1 μ g/m 3 . Determine
the concentration of the pesticide in the catfish.
4.43 3 Ethylbenzene is an aromatic hydrocarbon that is commonly found in con-
taminated sediments and waters. Its molecular weight is 106, log K ow is
3.15, vapor pressure is 1.3 kPa at 25 C, aqueous solubility is 0.0016 mol/L
at 25 C, enthalpy of vaporization is 2.1 kJ/mol, and enthalpy of solution
is 46.2 kJ/mol. (a) Find its vapor pressure at 30 C. (b) Find its aqueous
solubility at 30 C. (c) From the above data find its Henry's constant at
30 C and express in kPa/L/mol. (d) If the air above a lagoon has ethylben-
zene at a partial pressure of 0.1 kPa at 30 C in equilibrium with the water,
what is the aqueous concentration at that temperature? (e) If the water in
the lagoon is overlying the sediment in equilibrium with it at 30 C, and if
the sediment organic carbon fraction is 0.02, what is the concentration of
ethylbenzene in the sediment (answer in mg/kg)?
REFERENCES
Acha, R-Ch. and Rebhun, M. 1992. Biding of organic solutes to dissolved humic substances
and its effects on adsorption and transport in the aquatic environment. Water Research
26, 1645-1654.
Ashworth, R.A., Howe, G.B., Mullins, M.E., and Rogers, T.N. 1988. Air-water partitioning
coefficients of organics in dilute aqueous solutions. Journal of Hazardous Materials 18,
25-36.
Backhus, D.A. 1990. Colloids in groundwater—Laboratory and field studies of their influence
on hydrophobic organic contaminants , PhD dissertation, MIT, Cambridge, MA.
Baker, J.T. 1997. Atmospheric Deposition of Contaminants to the Great Lakes and Coastal
Waters . Pensacola, FL: SETAC Press.
Betterton, E.A. and Robinson, J.R. 1997. Henry's law constant of hydrazoic acid, Journal of
the Air & Waste Management Association 47, 1216-1219.
Bidleman, T.F. 1988. Atmospheric processes: Wet and dry deposition of organic compounds
controlled by their vapor-particle partitioning. Environmental Science and Technology
22, 361-367.
Bidleman, T.F. and Foreman, W.T. 1987. Vapor-particle partitioning of semi-volatile organic
compounds.In:S.E.Eisenreich(Ed.), SourcesandFatesofAquaticPollutants ,pp.27-56.
Washington, DC: ACS.
Boehm, P.D. and Quinn, J.G. 1973. Solubilization of hydrocarbons by the dissolved organic
matter in seawater. Geochimica et Cosmochimica Acta 37, 2459-2477.
Briggs, G.G. 1973. Proceedings of the 7th British Insecticide Fungicide Conference , 11,
475-478.
Broeker, W.S. and Peng, T.H. 1974. Gas exchange rates between air and the sea. Tellus 26,
21-35.
Brownawell, J.W. 1986. Role of colloidal organic matter in the marine geo-chemistry of PCBs.
PhD dissertation, MIT Press, MA.
Callaway, J.Y., Gabbita, K.V., and Vilker, V.L. 1984. Reduction of low molecular weight halo-
carbons in the vapor phase above concentrated humic acid solutions. Environmental
Science and Technology 18, 890-893.
 
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