EPA Method 551.1 Surrogate Standard Back Catalog number: 31102 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 2312.12-100-AN Isoproturon Price on request C14794500 MCPB-ethyl ester, 100mg Price on request 9398.20-5MG (+/-)-Citalopram-d4 hydrobromide (4-fluorophenyl-d4), neat, Solvent-neat, Unit 5mg, # of units-1, Cas.no. 1219803-58-3 Price on request