Why CHEMISTRY?

1. Understand & Predict human exposure and health effects;

2. Understand & Predict fate & effects in environment;

3. Design control measures

• Name: Pyrene• Molecular weight: 202• Boiling point: 404oC• Melting point: 156oC• Vapor pressure: 7.9x10-9 atm• Solubility: 0.135 mg/L • log Kow: 4.88

Solid at room temperature

Not highly volatile

Hydrophobic – may bioaccumulateModerately soluble

• 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?

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

GREENER?Compound B.P. Vap.Pres

s. (atm)Sol.

(M)

Log Kow

DDT 185 1.3x10-10 8.5x10-9 5.9

Hg 356 1.7x10-6 1.5x10-7

Atrazine Decomp. 3.9x10-10 1.3x10-4 2.5

Alachlor 100 4.1x10-8 9.0x10-4 2.8

Lindane 323 1.2x10-8 2.6x10-5 3.5

Toxaphene Decomp. 3.9x10-4 1.3x10-6 4.5

Chlordane 175 1.3x10-9 1.4x10-7 6

Dieldrin 175 6.6x10-9 3.7x10-7 5