EPA Method 551.1 Internal Standard Back Catalog number: 30103 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 676841 Cyflumetofen, 50mg Price on request 1828.10-1G 4-Phenylbutyric acid, neat, Solvent-neat, Unit 1g, # of units-1, Cas.no. 1821-12-1 Price on request 682246 2-Bromotoluene, 1000mg Price on request