1. Problem 3-5 in LaGrega Text.

2. Chemical of interest: PCE. or perchloroethylene (tetrachloroethene)
a. Draw its structure and write its chemical formula.
b. List its physical properties: MW. Sol, pvap, H, Koc, log Kow, BCF. Watch units!
c. PCE was found to be present in a WW sample at 58 ppm (58 mg/L).
i. What is its concentration in air at equilibrium?
ii. What % of saturation is the sample?
iii. Does PCE prefer the organic or aqueous phase? Why?
iv. If this material were dumped onto a soil of 12% OC. what would its concentration be in the soil?
3. A tube with 50 ml. octanol and 50 mL water and 0.2 g DDT is shaken until equilibrium is reached. What is the equilibrium concentration of DDT in the water phase?
4. A 1000 m3 lake has 1000 fish and 1 g DDT. If the volume of one fish is 100 cm3 and they have 5% lipids, what is the equilibrium concentration of DD 1 in the fatty tissue of one fish?