EPA Method 525 Surrogate Standard Back Catalog number: 93971 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 8344.35-K-IO Monocholestryl phthalate, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. Price on request R700852-1MG Roxithromycin-d7, 1mg Price on request 679649 1-Hydroxyibuprofen, 100 µg/ml, Acetonitrile, 1ml Price on request