EPA Method 551.1 Internal Standard Back Catalog number: 32103 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 682237 2,2'-Dihydroxy-4,4'-dimethoxybenzophenone, 1000mg Price on request 2007.12-5MG 3,4,4',5-Tetrachlorobiphenyl, neat, Solvent-neat, Unit 5mg, # of units-1, Cas.no. 70362-50-4 Price on request 677209 D8-Ciprofloxacin hydrochloride hydrate, 10mg Price on request