EPA Method 507 - Internal Standard Back Catalog number: 19031 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 677607 1H,1H,2H,2H-Perfluorooctanesulfonic acid, 10mg Price on request 2361.24-100-IP Di-n-octyl phthalate-3,4,5,6-d4, 100µg/mL, Solvent-isopropanol, Unit 1mL, # of units-1, Cas.no. 93952-13-7 Price on request 1600.12-10MG 4,4'-Dihydroxybiphenyl, neat, Solvent-neat, Unit 10mg, # of units-1, Cas.no. 92-88-6 Price on request