EPA Method 8141 Surrogate Standard Back Catalog number: 92387 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 673016 Progesterone, 250mg Price on request 66056 2,3,3',4'-Tetrachlorobiphenyl (56) Price on request 2516.16-100-ME Acetylsalicylsalicylic acid, 100µg/mL, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. 530-75-6 Price on request