EPA Method 507 - Internal Standard Back Catalog number: 19031 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended XA14950000AL Metazachlor, 100µg/mL in Acetonitrile, 1ml Price on request 0278.22-10MG Indeno[1,2,3-cd]fluoranthene, neat, Solvent-neat, Unit 10mg, # of units-1, Cas.no. 193-43-1 Price on request 1635.20-2MG 1-/3-Nitrobenzo[a]pyrene, neat, Solvent-neat, Unit 2mg, # of units-1, Cas.no. 70021-99-7/70021-98-6 Price on request