EPA Method 552 Internal Standard Back Catalog number: 30055 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 66017 2,2',4-Trichlorobiphenyl (17) Price on request N378012 2-Naphthylamine-d7, 5mg Price on request 10109.30-50-ME Tetraphenylrecorcinol bis(diphenylphosphate, 50µg/mL, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. 57583-54-7 Price on request