EPA Method 500 Internal Standard #6 Back Catalog number: 30169 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 1719.15-500-IO 4-Methylphenanthrene, 500µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 832-64-4 Price on request 96613 Quinine.HCl Price on request 680348 Cephalothin, 250mg Price on request