Retention Time Verification Standard

(-)- alpha-Cedrene, 500µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 469-61-4

Ethanol standard in serum,0.5g/L,serum, 1.5mL

4,4'-DDE, 100 µg/ml, Ethyl acetate, 5ml