EPA Method 551.1 Internal Standard Back Catalog number: 30103 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 679929 m-Xylene, 5ml Price on request 9424.8-10MG Valproic acid, neat, Solvent-neat, Unit 10mg, # of units-1, Cas.no. 99-66-1 Price on request 677217 gamma-HCH, 10 µg/ml, Acetonitrile, 10ml Price on request