EPA Method 551.1 Internal Standard Back Catalog number: 30103 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 673646 Oxadixyl, 100 µg/ml, Ethyl acetate, 5ml Price on request 1134.14-K-IO n-Tetradecane, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 629-59-4 Price on request 680991 Acetaminophen, 100 µg/ml, Acetonitrile, 1ml Price on request