EPA Method 548.1 Internal Standard Back Catalog number: 30078 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 8831.X-K-IO Natural alkyl pyrazines,1000 µg/mL,isooctane,1mL, Price on request 0444.15-10MG 4H-Cyclopenta[def]phenanthrene, neat, Solvent-neat, Unit 10mg, # of units-1, Cas.no. 203-64-5 Price on request 71610 4,4’-Dichlorobenzophenone Price on request