EPA Method 551.1 Internal Standard Back Catalog number: 30103 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 92111 EPA Method 8121 Chlorinated Hydrocarbons Price on request 676998 Dimethylpyrazolon (DP), 25mg Price on request 673855 1,2,4-Trichlorobenzene, 10 µg/ml, Cyclohexane, 1 Price on request