EPA Method 624 Internal / Surrogate Standard Back Catalog number: 92559 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 680449 Quintozene, 100 µg/ml, Ethyl acetate, 1ml Price on request 93995 Benzo(g,h,i)perylene Price on request 0038.28-200-T Diphenanthro[9,10-b;9',10'-d]thiophene, 200µg/mL, Solvent-toluene, Unit 1mL, # of units-1, Cas.no. 202-72-2 Price on request