EPA Method 548.1 Internal Standard Back Catalog number: 30078 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 681777 Monomethyl phthalate, 250mg Price on request 50110E TOC Calibration Standard Price on request 2044.15-K-IO 4-Nonylphenol, mixture of nonyl isomers, 1000µg/mLin Isooctane, 1ml Price on request