EPA Method 507 - Internal Standard Back Catalog number: 19031 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 56033 Arsenic (As) Price on request 0244.24-10MG Dibenzo[a,e]pyrene, neat, Solvent-neat, Unit 10mg, # of units-1, Cas.no. 192-65-4 Price on request 73061 Fentanyl-D5 Price on request