EPA Method 500 Internal Standard #6 Back Catalog number: 30169 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended DPE-74 2,4,4',5-Tetrachlorodiphenyl ether, 1.2ml x 50ug/ml, nonane Price on request 70404 Methyl methacrylate Price on request 676589 Urotropine, 250mg Price on request