EPA Method 528 Internal Standard Back Catalog number: 93188 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 682712 Methyl butyrate, 1000mg Price on request 9930.24-5MG 10:2 Di-PAPS-d4, neat, Solvent-neat, Unit 5mg, # of units-1, Cas.no. Price on request 79372 2,3,5,6-Tetrachloroanisole Price on request