Engineering, 19.02.2021 16:30 AnimeGurlBYah

I had mentioned in my lecture that DDT () had been used extensively to control the spread of malaria, and was later found to persist in the environment and causes thinning of bird egg shells, resulting in a declining bird population. However, you have been asked to investigate the fate of spraying 1,000 kg of DDT in the Sayong River Watershed, Malaysia. The following information is provided for DDT: Molecular Weight of DDT 354.49
Vapor Pressure 2 x 10^-5 Pa. m^3/mol K
Water Solubility 0.00012 mol/m^3
Henry's Law Constant 0.167 Pa. m^3/mol
KOC 6.35 x 10^5
KOW 1.55 x 10^6

In the model environment selected for this watershed, the following are the volumes of the various phases:

Area of Land 2060 m^2
Area of Water 124 m^2
Height of air compartment 700 m
Depth of Soil 0.2 m
Depth of Water 4m

Depth of Bottom Sediment 0.05 m
Other relevant properties of the model environment are as follows:
Organic carbon content in soil 0.03
Organic carbon content in sediment 0.025
Density of Soil 2400 kg/m^3
Density of Bottom Sediment 2000 kg/m^3
Determine the following:

a. Fugacity of DDT considering the phases of air, water, soil and bottom sediments only?
b. Concentrations of DDT at equilibrium in the various phases being considered?
c. Amount of DDT in each phase being considered?

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