EPA Method 502.2 Surrogate Standard Back Catalog number: 91704 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 674489 Permethrin, 10.0 µg/ml, Acetonitrile, 10ml Price on request D826000 Dydrogesterone, 25mg Price on request 0400.21-150-CY n-Heneicosane, ?13C: -28.59, 150µg/mL, Solvent-cyclohexane, Unit 1mL, # of units-1, Cas.no. 629-94-7 Price on request