Environmental Engineering Reference
In-Depth Information
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)?
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