EPA Method 502/524 Surrogate Standard #1 Back Catalog number: 30070 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 676926 4,4'-Diaminodiphenylmethane, 250mg Price on request 2551.18-100MG O-Acetylsalicylic anhydride, neat, Solvent-neat, Unit 100mg, # of units-1, Cas.no. 1466-82-6 Price on request 674945 Dodecyltrimethylammonium chloride, 100mg Price on request