McKay, Donald. "Front matter" Multimedia Environmental Models ...

Calculate the following physical-chemical properties for these substances at
25°C: fugacity ratio (1.0 for the liquid); Henry’s law constant; solubilities (mol/m 3 )
in air, water, and octanol; the three partition coefficients between these phases and
the activity coefficients in water and octanol. Assume a molar volume of 18 cm 3 /mol
for water and 120 cm 3 /mol for octanol. In the case of the solid, calculate both the
solid and supercooled liquid solubilities.
Calculate the Z values in air, water, octanol, and in the pure chemical phase
(assuming a density of 1 g/cm 3 if the chemical’s density is not readily available from
a handbook).
Using Fugacity Form 1 as a template, calculate Z values in the following media:
• soil solids containing 1% organic carbon
• suspended sediment solids containing 15% organic carbon
• bottom sediment solids containing 5% organic carbon
• aerosol particles
• fish containing 5% lipid
Assume K OC to be 0.41 K OW and all solid densities to be 2000 kg/m 3 .
Using Fugacity Form 2, calculate the fugacity, concentrations, and distribution
of 100 kg of each chemical in an environment consisting of these volumes:
air 10 9 m 3
water 10 6 m 3
soil solids 10 4 m 3
suspended sediment solids 50 m 3
bottom sediment solids 10 3 m 3
aerosols 1 m 3
fish 5 m 3
Alternatively, use the environment that was deduced in the concluding example from
Chapter 4.
Write a short account of the partitioning behavior of these substances. Where
would you analyze for monitoring purposes? Why? At what fraction of the saturation
conditions is the chemical present, i.e., the ratio of fugacity to vapor pressure? In
the water and atmosphere, what fractions of the total concentration are present in
each of the dispersed phases of aerosols, suspended sediment, and fish?
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