2. Why CHEMISTRY? 1.Understand & Predict human exposure and health effects; 2.Understand & Predict fate & effects in environment; 3.Design control measures

3. Name: Pyrene Molecular weight: 202 Boiling point: 404 o C Melting point: 156 o C Vapor pressure: 7.9x10 -9 atm Solubility: 0.135 mg/L log K ow : 4.88 Solid at room temperature Not highly volatile Hydrophobic – may bioaccumulate Moderately soluble

4. Where in the environment is it likely to be found; What will be major route of human exposure; Will it bioaccumulate? Will it be persistent?

5. Choose and design appropriate treatment; Predict where compound will go in conventional treatment schemes; Find “greener” alternatives;

6. GREENER? CompoundB.P.Vap.Pres s. (atm) Sol. (M) Log K ow DDT1851.3x10 -10 8.5x10 -9 5.9 Hg3561.7x10 -6 1.5x10 -7 AtrazineDecomp.3.9x10 -10 1.3x10 -4 2.5 Alachlor1004.1x10 -8 9.0x10 -4 2.8 Lindane3231.2x10 -8 2.6x10 -5 3.5 ToxapheneDecomp.3.9x10 -4 1.3x10 -6 4.5 Chlordane1751.3x10 -9 1.4x10 -7 6 Dieldrin1756.6x10 -9 3.7x10 -7 5